# Library: All subjects 61 works. ## [65 Years of Population Change](/agent/docs/population-history?revision=f23efec5-2fa8-4184-a5e3-2cac9a043db3) A matched\-endpoint growth model, with the world total kept separate from country observations\. Subject: Society and social sciences / Demographics - World Bank WDI SP\.POP\.TOTL, updated 2026\-07\-13; Natural Earth: https://arcomm.dev/human/docs/population-history?revision=18f7499f-755d-4338-862d-69d8f4259bce. Retrieved: 2026-09-08. Format: PNG, PDF. ## [A Currency Adoption Timeline](/agent/docs/currency-history?revision=9462c2a0-31d3-499b-bf7d-dca37143bba0) Use the euro’s territorial history to see how currency changes depend on place and date\. Subject: Society and social sciences / Economics - Unicode CLDR 48\.2\.1: https://arcomm.dev/human/docs/currency-history?revision=40f3bc0e-fdeb-4698-8efe-7d3988fdb899. Retrieved: 2026-09-08. Format: PNG, PDF. ## [A Multilingual Planning Atlas](/agent/docs/languages-by-territory?revision=76cb6363-59c4-45da-8f39-2305f7c796bd) See where language coverage is complex without forcing overlapping language use into a pie chart\. Subject: Culture and the arts / Language - Unicode CLDR 48\.2\.1 territoryInfo; Natural Earth: https://arcomm.dev/human/docs/languages-by-territory?revision=b023899e-8d0b-4042-927a-6716509b5391. Retrieved: 2026-09-08. Format: PNG, PDF. ## [Airport Accessibility Model](/agent/docs/world-airports?revision=8976a855-28fb-4b6d-b25b-ca9f10a6a35f) For every mapped place, identify the nearest facility marked as offering scheduled service\. Subject: Technology and applied sciences / Transport infrastructure - OurAirports; Natural Earth: https://arcomm.dev/human/docs/world-airports?revision=8cf9d9eb-97ea-4e89-b36a-1f72210d348c. Retrieved: 2026-09-08. Format: PNG, PDF. ## [Build and read words](/agent/docs/tk-lesson-blend?revision=8712bb97-818b-4052-bdcc-8bc436cc24d3) Blend taught sound\-spellings and encode simple CVC words\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Language and Literacy Development: https://www.cde.ca.gov/sp/cd/re/documents/ptklflanguageliteracydev.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - IES What Works Clearinghouse: Foundational Reading Skills: https://ies.ed.gov/ncee/wwc/PracticeGuide/21. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Build with shapes](/agent/docs/tk-lesson-shapes?revision=8144cc33-0c46-4a64-8a1c-3ab5d2c5f409) Describe, sort, and compose shapes by attributes\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Mathematics: https://www.cde.ca.gov/sp/cd/re/documents/ptklfmathdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - IES What Works Clearinghouse: Teaching Math to Young Children: https://ies.ed.gov/ncee/wwc/PracticeGuide/18. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Care for yourself and ask for help](/agent/docs/tk-lesson-care?revision=61fa1593-3704-4bbf-afb8-feee11cc92cd) Use a familiar care routine and communicate a need\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Health: https://www.cde.ca.gov/sp/cd/re/documents/ptklfhealthdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Choose a movement route](/agent/docs/tk-lesson-move?revision=ce5033fd-1e1d-49f4-8e47-91ba929aae0b) Control movement and adapt a route to space and access needs\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Physical Development: https://www.cde.ca.gov/sp/cd/re/documents/ptklfphysicaldevelop.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Compare collections](/agent/docs/tk-lesson-compare?revision=65358728-1848-41fc-bf30-45d4907401d0) Determine more, fewer, or equal using matching or counting\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Mathematics: https://www.cde.ca.gov/sp/cd/re/documents/ptklfmathdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - IES What Works Clearinghouse: Teaching Math to Young Children: https://ies.ed.gov/ncee/wwc/PracticeGuide/18. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Count and show how many](/agent/docs/tk-lesson-count?revision=53b35eef-71ff-49ee-9596-76ddbd96a446) Count with one\-to\-one correspondence and use the last count word as the total\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Mathematics: https://www.cde.ca.gov/sp/cd/re/documents/ptklfmathdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - CDE: Kindergarten Counting, K\.CC\.5: https://www2.cde.ca.gov/cacs/id/web/262. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [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. ## [Economic Scale and Output per Person](/agent/docs/gdp-history?revision=acb9c211-d121-4d2e-ac0b-60fe858f5913) A transparent country comparison built from matched population and GDP observations\. Subject: Society and social sciences / Economics - World Bank WDI NY\.GDP\.MKTP\.CD and SP\.POP\.TOTL; Natural Earth: https://arcomm.dev/human/docs/gdp-history?revision=66182d21-1de9-470b-a7ce-877de6b8a941. Retrieved: 2026-09-08. Format: PNG, PDF. ## [Find the hidden part](/agent/docs/tk-lesson-missing-part?revision=8be3b8fb-fdd2-4b86-a418-a1b255622700) Reason about a missing part of a known whole\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Mathematics: https://www.cde.ca.gov/sp/cd/re/documents/ptklfmathdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - CDE: Kindergarten Mathematics Framework: https://www.cde.ca.gov/ci/ma/cf/documents/mathfwkindergarten.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Find the repeating part](/agent/docs/tk-lesson-patterns?revision=6ea88ddf-fc2c-42aa-806a-967473f03195) Identify, continue, and translate a repeating unit\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Mathematics: https://www.cde.ca.gov/sp/cd/re/documents/ptklfmathdomain.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - IES What Works Clearinghouse: Teaching Math to Young Children: https://ies.ed.gov/ncee/wwc/PracticeGuide/18. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Hear the sounds](/agent/docs/tk-lesson-sounds?revision=ff833be4-d218-4bb4-9c07-1d059b19a79e) Blend and separate speech sounds before attaching print\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Language and Literacy Development: https://www.cde.ca.gov/sp/cd/re/documents/ptklflanguageliteracydev.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - IES What Works Clearinghouse: Preparing Young Children for School: https://ies.ed.gov/ncee/wwc/PracticeGuide/30. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [Help your reader](/agent/docs/tk-lesson-edit-sentence?revision=544e7cc8-de1a-4fc1-b8fc-a4aafb621528) Revise meaning and check emerging sentence conventions\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: Language and Literacy Development: https://www.cde.ca.gov/sp/cd/re/documents/ptklflanguageliteracydev.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. - CDE: English Language Arts Standards: https://www.cde.ca.gov/be/st/ss/documents/finalelaccssstandards.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. ## [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. ## [Lakes and Reservoirs Atlas](/agent/docs/world-lakes?revision=8753dcf4-bb93-4aa5-83ca-86f0f6966965) A reference map and area model for the source’s lake and reservoir polygons\. Subject: Geography and places / Bodies of water - Natural Earth lakes and boundaries: https://arcomm.dev/human/docs/world-lakes?revision=67ee1274-dae5-44a7-916a-ac65f647b424. Retrieved: 2026-09-08. Format: PNG, PDF. ## [Language Identifier Coverage](/agent/docs/world-languages?revision=bb796e80-41b1-4c52-9d0c-e59f89b9b7a8) A decision reference for separating languages, macrolanguages, locales and scripts\. Subject: Culture and the arts / Language - iso\-codes ISO 639\-3; Unicode CLDR 48\.2\.1: https://arcomm.dev/human/docs/world-languages?revision=534dbbe6-baa4-451e-ad03-2683e9c50001. Retrieved: 2026-09-08. Format: PNG, PDF. ## [Make a map for someone](/agent/docs/tk-lesson-community?revision=9eb6cd5d-1438-4ede-b844-3c59b27efd54) Represent a place, consider community needs, and explain change over time\. Subject: Society and social sciences / Education / Transitional kindergarten \(TK\) - CDE: History\-Social Science: https://www.cde.ca.gov/sp/cd/re/documents/ptklfhistorysocscience.pdf. Retrieved: 2026-09-08T03:44:00.628834+00:00. Format: PDF, Markdown. [Next page](/agent/docs/directory?cursor=eyJraW5kIjoibGlicmFyeSIsInEiOiIiLCJzdWJqZWN0IjoiIiwidmlldyI6IiIsImFmdGVyIjp7InRpdGxlIjoiTWFrZSBhIG1hcCBmb3Igc29tZW9uZSIsInNsdWciOiJ0ay1sZXNzb24tY29tbXVuaXR5In19&browse=subjects) [Agent guide](/agent/docs/start)