104 State Water Plan Watersheds: Pennsylvania
1998. Environmental Resources Research Institute. Digitized boundaries of 104 major watersheds defined in the Pennsylvania state water plan. The State Water Plan, originally developed in the 1970s,...
Census Block Groups: Philadephia, Pennsylvania
2010. U.S. Department of Commerce, U.S. Census Bureau, Geography Division. The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from ...
Chesapeake Bay region state boundaries
1996. Penn State ORSER/ERRI. Boundaries for the states in the Chesapeake Bay region.
Small Watersheds: Pennsylvania
2014. Boundaries of 9,895 watersheds in Pennsylvania indicated in the Pennsylvania gazetteer of streams. These boundaries enclose catchment areas for nam...
Small Watersheds: Pennsylvania
1997. Environmental Resources Research Institute. Boundaries of 9,895 watersheds in Pennsylvania indicated in the Pennsylvania gazetteer of streams. These boundaries enclose catchment areas for nam...
