National Geologic Map Database
General Information
- Title: Early Silurian formations of southeastern Pennsylvania
- Author(s): Swartz, C.K., and Swartz, F.M.
- Publishing Organization: Geological Society of America
- Series and Number: Bulletin v. 42 no. 3 [p. 621-661]
- Publication Date: 1931
- Map Scale: 1:5,700,000
- Cross Section: Yes
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