search

Search the National Library's catalog - books, newspapers, journals, photos, maps, music, manuscripts, radio/TV and more, both physical and digitized. Digitized text (OCR) is matched too by default, so a query can surface newspaper or book pages that mention a term even when it's not in the title.

Signature: search(q: string, required; media_type: string, optional, default None; language: string, optional, default None; county: string, optional, default None; year_from: integer, optional, default None; year_to: integer, optional, default None; digital_only: yes/no, optional, default False; sort: string, optional, default None; page: integer, optional, default 0; size: integer, optional, default 10; limit: integer, items, optional, default 25; offset: integer, items, optional, default 0)

Direct GET

For navigating agents: open the HTML page with parameters in the URL. The result is fetched and displayed without screenshots or form filling.

Open this validated HTML GET URL

https://allemannsdata.com/wiki/kilder/nasjonalbiblioteket/search/?q={q}&media_type={media_type}&language={language}&county={county}&year_from={year_from}&year_to={year_to}&digital_only=false&sort={sort}&page=0&size=10&limit=25&offset=0

Replace {q}, {media_type}, {language}, {county}, {year_from}, {year_to}, {digital_only}, {sort}, {page}, {size} with values. Remove unused optional parameters from the URL.

For software and dashboards: Read the operation descriptor. The JSON GET template is https://allemannsdata.com/wiki/api/v1/kilder/nasjonalbiblioteket/search?q={q}&media_type={media_type}&language={language}&county={county}&year_from={year_from}&year_to={year_to}&digital_only=false&sort={sort}&page=0&size=10&limit=25&offset=0. Open this exact request as JSON.

Parameter	Requirement	JSON type	Description
`q`	required	string	Free-text query. Supports field-restricted terms too, e.g. "subject:fiske year:1970" combined with free text.
`media_type`	optional	union	Restrict to one type, e.g. aviser (newspapers), bøker (books), tidsskrift (journals), bilder (photos), musikk, kart (maps), film, plakater (posters), noter (sheet music), radio, fjernsyn. See get_aggregations(q="*", group_by="mediatype") for the full list with counts.
`language`	optional	union	Language filter - values are inconsistent in the catalog (mixes codes like "nob" and labels like "Norsk bokmål"); check get_aggregations(q=q, group_by="languages") first if unsure.
`county`	optional	union	Norwegian county name, e.g. "Troms", "Oslo".
`year_from`	optional	union	Restrict to items published/issued in this year range (inclusive).
`year_to`	optional	union	Restrict to items published/issued in this year range (inclusive).
`digital_only`	optional	boolean	Only items that have been digitized.
`sort`	optional	union	One of date, title, otherid, firstDigitalContentTime, optionally suffixed ",desc" (default: relevance).
`page`	optional	integer	Zero-based page index.
`size`	optional	integer	Results per page, 1 to 100 (default 10).
`limit`	optional	integer	Gateway page size; default 25, maximum 100.
`offset`	optional	integer	Number of list items to skip; default 0.

Generated JavaScript, Python and response structure

Use JSON when the user requests code, machine-readable data, value extraction or further computation. Use the HTML GET page to identify the correct source and verify parameters.

Example for generated JavaScript and Python

https://allemannsdata.com/wiki/api/v1/kilder/nasjonalbiblioteket/search?q={q}&media_type={media_type}&language={language}&county={county}&year_from={year_from}&year_to={year_to}&digital_only=false&sort={sort}&page=0&size=10&limit=25&offset=0

Replace URL placeholders and remove unused optional parameters.

JavaScript in a dashboard

const url = "https://allemannsdata.com/wiki/api/v1/kilder/nasjonalbiblioteket/search?q={q}&media_type={media_type}&language={language}&county={county}&year_from={year_from}&year_to={year_to}&digital_only=false&sort={sort}&page=0&size=10&limit=25&offset=0";
const response = await fetch(url);
if (!response.ok) {
  const failure = await response.json();
  throw new Error(`${failure.error.code}: ${failure.error.message} ${failure.suggestion}`);
}
const result = await response.json();
const data = result.data;

Python without additional packages

import json
from urllib.request import urlopen

url = "https://allemannsdata.com/wiki/api/v1/kilder/nasjonalbiblioteket/search?q={q}&media_type={media_type}&language={language}&county={county}&year_from={year_from}&year_to={year_to}&digital_only=false&sort={sort}&page=0&size=10&limit=25&offset=0"
with urlopen(url) as response:
    result = json.load(response)
data = result["data"]

Response structure

{
  "source": "nasjonalbiblioteket",
  "operation": "search",
  "parameters": {},
  "data": {},
  "entities": [],
  "_meta": {"retrieved_at": "...", "sources": [], "cache": {}},
  "_links": {"self": "...", "source": "...", "wiki": "...", "feedback": "..."}
}

Form for manual use

The form is a fallback for people and browser agents that cannot open the GET URL directly.

q (required) Type: string. Free-text query. Supports field-restricted terms too, e.g. "subject:fiske year:1970" combined with free text.

media_type Type: string. Restrict to one type, e.g. aviser (newspapers), bøker (books), tidsskrift (journals), bilder (photos), musikk, kart (maps), film, plakater (posters), noter (sheet music), radio, fjernsyn. See get_aggregations(q="*", group_by="mediatype") for the full list with counts.

language Type: string. Language filter - values are inconsistent in the catalog (mixes codes like "nob" and labels like "Norsk bokmål"); check get_aggregations(q=q, group_by="languages") first if unsure.

county Type: string. Norwegian county name, e.g. "Troms", "Oslo".

year_from Type: integer. Restrict to items published/issued in this year range (inclusive).

year_to Type: integer. Restrict to items published/issued in this year range (inclusive).

digital_only Type: yes/no. Only items that have been digitized.

sort Type: string. One of date, title, otherid, firstDigitalContentTime, optionally suffixed ",desc" (default: relevance).

page Type: integer. Zero-based page index.

size Type: integer. Results per page, 1 to 100 (default 10).

Result

Source: National Library of Norway. Retrieved 2026-10-19T14:23:12Z in 0.294 seconds.

total:

10624

page:

size:

items:

25 results

id:
eb03466b41f689a3918385a73ad45f8f
urn:
URN:NBN:no-nb_digibok_2020092207741
title:
Midt-Telemarks energi gjennom 100 år : 1916-2016
creators:
2 results
1. Skobba, Ingvar
2. Langseth, Bjarne
year:
2016
publisher:
Midt-Telemark energi
media_types:
1 results
1. bøker
languages:
1 results
1. nob
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digibok_2020092207741_C1/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/eb03466b41f689a3918385a73ad45f8f
id:
596c76daf68c4742a3491521537ef350
urn:
URN:NBN:no-nb_digibok_2022011048069
title:
Soga om SØK : Skånevik kraftlag og Ølen Bjoa Vikebygd kraftlag
creators:
1 results
1. Tjelmeland, Sjur
year:
2021
publisher:
Våge multimedia
media_types:
1 results
1. bøker
languages:
1 results
1. nno
county:
Vestland
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digibok_2022011048069_C1/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/596c76daf68c4742a3491521537ef350
id:
ed0e34b01e61cff7de663d0fa00bc516
urn:
URN:NBN:no-nb_digitidsskrift_2025041080028_010
title:
Bok & samfunn (trykt utg.) : fagbladet for bokbransjen. 2011 Vol. 132 Nr. 10
creators:
2 results
1. Den Norske bokhandlerforening
2. Bok & samfunn AS
year:
2011
publisher:
Bok & samfunn AS
media_types:
1 results
1. tidsskrift
languages:
1 results
1. nob
county:
not reported by source
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digitidsskrift_2025041080028_010_0001/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/ed0e34b01e61cff7de663d0fa00bc516
id:
e19937da5fac5f1499ff621a099e9384
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20100930_25_35_1
title:
Bø blad
creators:
not reported by source
year:
20100930
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20100930_25_35_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/e19937da5fac5f1499ff621a099e9384
id:
5c126c4b207966a9277baba2187e2130
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20070802_19_27_1
title:
Bø blad
creators:
not reported by source
year:
20070802
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20070802_19_27_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/5c126c4b207966a9277baba2187e2130
id:
24e4a52f2bc26ec9336f766feb1d0e8a
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20070125_19_4_1
title:
Bø blad
creators:
not reported by source
year:
20070125
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20070125_19_4_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/24e4a52f2bc26ec9336f766feb1d0e8a
id:
2e5d445fd419dc4cd440a92c0d7362a3
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20060727_19_26_1
title:
Bø blad
creators:
not reported by source
year:
20060727
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20060727_19_26_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/2e5d445fd419dc4cd440a92c0d7362a3
id:
d8c199376afe3995dc8f177994c268bc
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20080131_23_5_1
title:
Bø blad
creators:
not reported by source
year:
20080131
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20080131_23_5_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/d8c199376afe3995dc8f177994c268bc
id:
4e937e78a8389f4baa79f231da969713
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20051208_19_45_1
title:
Bø blad
creators:
not reported by source
year:
20051208
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20051208_19_45_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/4e937e78a8389f4baa79f231da969713
id:
72139b735032baf2982beadf918e7337
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20070201_19_5_1
title:
Bø blad
creators:
not reported by source
year:
20070201
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20070201_19_5_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/72139b735032baf2982beadf918e7337
id:
02b262e98e7ef8f6bd7ba6598853225c
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20070809_19_28_1
title:
Bø blad
creators:
not reported by source
year:
20070809
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20070809_19_28_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/02b262e98e7ef8f6bd7ba6598853225c
id:
9364310377ec3ef9748723d2f74b720e
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20060817_19_29_1
title:
Bø blad
creators:
not reported by source
year:
20060817
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20060817_19_29_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/9364310377ec3ef9748723d2f74b720e
id:
ac365dc68511b35b29ab26b23a4e25f4
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20090219_25_7_1
title:
Bø blad
creators:
not reported by source
year:
20090219
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20090219_25_7_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/ac365dc68511b35b29ab26b23a4e25f4
id:
1717e6c8c01f64f4c4cfa9b9685458ef
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20070816_19_29_1
title:
Bø blad
creators:
not reported by source
year:
20070816
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20070816_19_29_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/1717e6c8c01f64f4c4cfa9b9685458ef
id:
0b7c852ffd6ea976263228f2c7b82754
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20110113_0_2_1
title:
Bø blad
creators:
not reported by source
year:
20110113
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20110113_0_2_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/0b7c852ffd6ea976263228f2c7b82754
id:
f72fbff9f063fb9c7e206b0c6e8c8bf1
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20060810_19_28_1
title:
Bø blad
creators:
not reported by source
year:
20060810
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20060810_19_28_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/f72fbff9f063fb9c7e206b0c6e8c8bf1
id:
c426834a1625356f5192b1c13b8bf7b4
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20160414_1_14_1
title:
Bø blad
creators:
not reported by source
year:
20160414
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20160414_1_14_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/c426834a1625356f5192b1c13b8bf7b4
id:
883e4a845db0ddacdcb9a8fda82c19bb
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20160317_null_11_1
title:
Bø blad
creators:
not reported by source
year:
20160317
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20160317_null_11_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/883e4a845db0ddacdcb9a8fda82c19bb
id:
ce0ade06b73c48cd0489c22cae6f4a5e
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20080731_23_27_1
title:
Bø blad
creators:
not reported by source
year:
20080731
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20080731_23_27_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/ce0ade06b73c48cd0489c22cae6f4a5e
id:
ce5cc1f20aa839ff6c3fa4c156b60e96
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20100805_25_27_1
title:
Bø blad
creators:
not reported by source
year:
20100805
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20100805_25_27_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/ce5cc1f20aa839ff6c3fa4c156b60e96
id:
9deddac8b35193cc0681974a3e1ec411
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20080626_23_25_1
title:
Bø blad
creators:
not reported by source
year:
20080626
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20080626_23_25_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/9deddac8b35193cc0681974a3e1ec411
id:
57f978581052ae141172e621c4cc03fa
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20110707_0_26_1
title:
Bø blad
creators:
not reported by source
year:
20110707
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20110707_0_26_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/57f978581052ae141172e621c4cc03fa
id:
4f3f0f533c596f542ae4bc510331a936
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20110804_0_27_1
title:
Bø blad
creators:
not reported by source
year:
20110804
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20110804_0_27_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/4f3f0f533c596f542ae4bc510331a936
id:
f9eccda35a4afc05c3b6faf1f990dd9f
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20061207_19_45_1
title:
Bø blad
creators:
not reported by source
year:
20061207
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20061207_19_45_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/f9eccda35a4afc05c3b6faf1f990dd9f
id:
93b4cc2ee0efa6825da1416297adc21d
urn:
URN:NBN:no-nb_digavis_boblad_null_null_20060608_19_22_1
title:
Bø blad
creators:
not reported by source
year:
20060608
publisher:
not reported by source
media_types:
1 results
1. aviser
languages:
1 results
1. Norsk bokmål
county:
Telemark
digital:
yes
public_domain:
no
license:
copyrighted
viewability:
NONE
access_allowed_from:
NB
thumbnail:
https://www.nb.no/services/image/resolver/URN:NBN:no-nb_digavis_boblad_null_null_20060608_19_22_1-1_001_null/full/0,128/0/native.jpg
viewer_url:
https://www.nb.no/items/93b4cc2ee0efa6825da1416297adc21d

limit:

offset:

returned:

has_more_results:

yes

next_offset:

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Ground rule: Navigate with HTML GET links to keep explanations and relationships. Use the page's JSON alternative only when concrete values must be extracted, compared or computed.

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Replace the placeholders in the HTML GET template; remove optional parameters you do not need.
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