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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 (210)
Subject
Stratigraphy (50)
Cities, Towns, and Buildings (39)
Oil and Gas (29)
Nonmetallic Mineral Resources (26)
Topography (25)
Landslides (9)
Structure-Faults (6)
Rivers and Streams (5)
Engineering (4)
Glacial Geology (4)
Location Covered
Allegheny (210)
Original Format
Photographs (210)
Date
1926-10-07 (31)
1926-10-06 (16)
1920-01-01 (15)
1927-10-01 (12)
1921-01-01 (9)
1925-06-04 (7)
1919-12-15 (6)
1921-09-01 (6)
1922-08-15 (6)
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Pennsylvania Geological Survey - Historical Photographs
210 items
210 items
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