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Hydrologic Unit Map -- 1974, State of Pennsylvania

January 1, 1974

This map and accompanying table show Hydrologic Units that are basically hydrographic in nature.  The Cataloging Units shown will supplant the Cataloging Units previously used by the U.S. Geological Survey in its Catalog of Information on Water Data (1966-72).  The previous U.S. Geological Survey Catalog-Indexing System was by map number and letter, such as 49M.  

Publication Year 1974
Title Hydrologic Unit Map -- 1974, State of Pennsylvania
DOI 10.3133/hu39
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Hydrologic Unit
Series Number 39
Index ID hu39
Record Source USGS Publications Warehouse