USGS Historical Topographic Map Collection via topoView
U.S. Geological Survey (NGMDB)
1884-2006 scans at 1:24k-1:250k. Older quads often show springs, cabins, mine shafts, and trails dropped from modern maps — genuinely useful survival detail — and make a differentiating 'historic layer'.
Editor's notes
Content is outdated by definition (roads, dams, shorelines changed); must be clearly labeled historical, not for current navigation. Bulk delivery of superseded maps is only via topoView, not the staged bulk pipeline.
GeoPDF, GeoTIFF, JPEG, KMZ
178,000+ maps; ~10-50 MB each depending on format
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Source & license
US federal government work (public domain).
Use of this material does not imply endorsement by its publisher or any government agency.