National Geologic Map Database
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Title: The Helderberg group from central Pennsylvania to southwestern Virginia
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Author(s): Swartz, F.M.
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Publishing Organization: Pennsylvania Academy of Science
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Series and Number: Proceedings v. 3 [p. 75-89]
- Publication Date: 1929
- Cross Section: None
- North Latitude: 42° 16' 12" N (42.2700)
- South Latitude: 36° 32' 27" N (36.5408)
- East Longitude: 74° 41' 22" W (-74.6894)
- West Longitude: 83° 40' 31" W (-83.6753)
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