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More by Pennsylvania. Geological Survey
Annual Report of the Geological Survey of Pennsylvania: Part 4
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Annual Report of the Geological Survey of Pennsylvania: Part 1
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Final Report Ordered by Legislature, 1891: Laurentian, Huronian, Cambrian and Lower Silurian formations, by J.P. Lesley
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The Geology of Pennsylvania: Metamorphic strata: Gneissic rocks
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