This catalog groups 3 Collections. Each carries its own AGENTS.md with join keys, quirks, and tested queries, so follow the per-collection guides below.
United States Counties (2023, 1:500k), 3,235 polygons, guide at ./us-counties/AGENTS.md
Boston Open Space, 1,012 polygons, guide at ./boston-open-space/AGENTS.md
Netherlands Provinces, 12 polygons, guide at ./netherlands-provinces/AGENTS.md