# Library: Countries and administrative areas

4 works.

## [Country Code Reference Wall](/agent/docs/world-country-codes?revision=7f2e5d3e-c7ab-4351-9152-c3b19fccf950)

A complete lookup sheet: alpha\-2, alpha\-3, numeric identifier, then the reference name\.

Subject: Geography and places / Countries and administrative areas

- iso\-codes snapshot 2026\-09\-08: https://arcomm.dev/human/docs/world-country-codes?revision=7c890325-cdac-4e40-b71d-f92195d4ee95. Retrieved: 2026-09-08.

Format: PNG, PDF.

## [How Boundary Labels Differ](/agent/docs/world-country-boundaries?revision=594cdb00-ad5f-49e5-868c-571579ea3cc4)

Locate features whose administrative code changes across the source’s geopolitical viewpoints\.

Subject: Geography and places / Countries and administrative areas

- Natural Earth pinned source snapshot: https://arcomm.dev/human/docs/world-country-boundaries?revision=cd86c628-6a00-4a7d-ab06-e7e3da04622f. Retrieved: 2026-09-08.

Format: PNG, PDF.

## [Subdivision Structure Atlas](/agent/docs/administrative-subdivisions?revision=f342fbd5-82c1-42d8-857a-c51ea3d5d41e)

See the scope and hierarchy of administrative identifiers before joining local records\.

Subject: Geography and places / Countries and administrative areas

- iso\-codes ISO 3166\-2; Natural Earth: https://arcomm.dev/human/docs/administrative-subdivisions?revision=aaea5eec-3171-4f44-aa50-321e8324f6dd. Retrieved: 2026-09-08.

Format: PNG, PDF.

## [When Country Identifiers Changed](/agent/docs/historical-country-codes?revision=5095a96e-2953-4dd7-9b30-d77af0f3a953)

A timeline for matching archival records to withdrawn names and identifier systems\.

Subject: Geography and places / Countries and administrative areas

- iso\-codes ISO 3166\-3 snapshot: https://arcomm.dev/human/docs/historical-country-codes?revision=d778454e-c1a1-4866-a689-bdb9ebaff80b. Retrieved: 2026-09-08.

Format: PNG, PDF.

[Agent guide](/agent/docs/start)