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Pennsylvania. Bureau of Topographic and Geologic Survey.
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MIT
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1. Distribution of Pennsylvania coals
Pennsylvania. Bureau of Topographic and Geologic Survey. The Dept. of Conservation and Natural Resources,.
2. French Creek State Park /
Pennsylvania. Bureau of Topographic and Geologic Survey. The Bureau,.
3. Geologic map of Pennsylvania
Pennsylvania. Bureau of Topographic and Geologic Survey. The Dept. of Conservation and Natural Resources,.
4. Geologic map of Pennsylvania
Pennsylvania. Bureau of Topographic and Geologic Survey. The Dept. of Conservation and Natural Resources,.
5. Geologic map of Pennsylvania 1980 /
Pennsylvania. Bureau of Topographic and Geologic Survey. Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey,.
6. Greater Pittsburgh region geologic map
Pennsylvania. Bureau of Topographic and Geologic Survey. U.S. Geological Survey ;.
7. Greater Pittsburgh region maps of mined-out areas and thickness of rock over the Pittsburgh coal
Pennsylvania. Bureau of Topographic and Geologic Survey. U.S. Geological Survey ;.
8. Greater Pittsburgh region structure contour map of Allegheny, Armstrong, Beaver, Butler, Washington, and Westmoreland Counties /
Pennsylvania. Bureau of Topographic and Geologic Survey. U.S. Geological Survey ;.
9. Limestone and dolomite distribution in Pennsylvania /
Pennsylvania. Bureau of Topographic and Geologic Survey. The Bureau,.
10. Map of the Mercer clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania
Pennsylvania. Bureau of Topographic and Geologic Survey. Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey,.
11. Natural gas pipelines and crude oil pipelines of Pennsylvania 1:500,000 /
Pennsylvania. Bureau of Topographic and Geologic Survey. Pennsylvania Bureau of Topographic and Geologic Survey,.