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Pennsylvania Geological Survey - Historical Photographs - Browse all items - Pennsylvania Photos and Documents
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Contributing Institution
Pennsylvania Geological Survey (33)
Subject
Stratigraphy (17)
Topography (13)
Nonmetallic Mineral Resources (3)
Location Covered
Blair (31)
Bradford (1)
Cambria (1)
Original Format
Photographs (33)
Date
1923-08-21 (33)
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Pennsylvania Geological Survey - Historical Photographs
33 items
33 items
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