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1. Geology: Montgomery County, Pennsylvania

2020. U.S. Geological Survey, Southwest Region. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States (https://doi.org/10.5066/F7WH2N65) represents a seamless, s...
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6. Ecoregions of Pennsylvania Level III

2010. U S Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
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7. Ecoregions of Pennsylvania Level IV

2010. U S Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
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15. Ecoregions United States (Omernik)

2003. U S Environmental Protection Agency. This map layer shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of Omernik...
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16. Bedrock Geology: Pennsylvania

2001. Pennsylvania Department of Conservation and Natural Resources. Two digital data sets, one for geologic units and faults and the other for dikes, have been prepared for Pennsylvania. The data sets were digitized...
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17. Late Wisconsinan Glacial Border 1:100,000

1995. Pennsylvania Department of Conservation and Natural Resources. Late in 1994, the Pennsylvania Bureau of Topographic and Geologic Survey was asked to develop a digital physiographic provinces map at 1:100,000 sc...
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18. Late Wisconsinan Glacial Border 1:500,000

1995. Pennsylvania Department of Conservation and Natural Resources. Late in 1994, the Pennsylvania Bureau of Topographic and Geologic Survey was asked to develop a digital physiographic provinces map at 1:100,000 sc...
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19. Physiographic Provinces 1:100,000: Pennsylvania

1995. Pennsylvania Department of Conservation and Natural Resources. Late in 1994, the Pennsylvania Bureau of Topographic and Geologic Survey was asked to develop a digital physiographic provinces map at 1:100,000 sc...
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20. Physiographic Provinces 1:500,000: Pennsylvania

1995. Pennsylvania Department of Conservation and Natural Resources. Late in 1994, the Pennsylvania Bureau of Topographic and Geologic Survey was asked to develop a digital physiographic provinces map at 1:100,000 sc...