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Bureau of Toppographic and Geologic Survey, Department of Conservaton and Natural Resources
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Year
2007
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1. Digital data set of mapped karst features in south-central and southeastern Pennsylvania
2007. Bureau of Toppographic and Geologic Survey, Department of Conservaton and Natural Resources. This point dataset represents an (incomplete) inventory of karst features (herein categorized as sinkholes, surface depressions, surface mines, or ...