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In 2001, the Bureau of Topographic and Geologic Survey (the Bureau) released the Digital Bedrock Geology of Pennsylvania. This dataset was based on Map 1, Geologic Map of...
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View within SubmissionGathering Resources...From the site: "Coal Pillar Locations are pillars of coal that must remain in place to provide support for an oil and gas well on the surface."-
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View within SubmissionGathering Resources... -