First[-sixth] annual report on the Geological survey of Pennsylvania /
By Henry D. Rogers, state geologist ... [1836-1841].
APA Citation
Geological Survey of Pennsylvania., Rogers, H. D. (Henry Darwin). (183642). First[-sixth] annual report on the Geological survey of Pennsylvania. Harrisburg.
MLA Citation
Geological Survey of Pennsylvania, and Henry D. (Henry Darwin) Rogers. First[-sixth] Annual Report On the Geological Survey of Pennsylvania. Harrisburg, 183642.
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