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USGS Numbered Series
Hydrologic Unit Map -- 1974, Pennsylvania
1 map : col. ; 62 x 120 cm., folded in envelope 30 x 24 cm.; An overprint of the 1:500,000-scale state base map. Shows counties, location and names of all cities and towns and most of the smaller settlements, and railroads in black; water features in blue; hydrologic boundaries and codes in red; county codes in green. No contours. Sheet 29 by 49 inches. 1953 base.