Description: This dataset contains the boundaries of the U.S. Geological Survey 30' x 60' (1:100,000-scale) topographic quadrangle maps, NAD27, for the state of Wyoming.These boundaries correspond to 100k historical topo map boundaries, all of which use the NAD27 datum and were never remade for NAD83.The National Map (TNM) downloader does not appear to provide NAD27 quadrangle boundaries. Instead, these boundaries were derived from the WSGS dataset, at shared drive location I:\Data\GIS\Base\Wyoming\Quad_Index.gdb, circa 2010s.
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