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Map regions
Alexandria Digital Library Feature Type Thesaurus
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Map quadrangle regions (2 items)

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Quadrangle indexes [More info]
GIS data files containing approximate boundaries of the various USGS quadrangles, with names and indexing codes associated with each quadrangle.
PDF Scanning and georeferencing historical USGS quadrangles [More info]
We are scanning all scales and all editions of approximately 250,000 topographic maps published by USGS since the inception of the topographic mapping program in 1884. They will be available to the public at no direct cost.
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