A series of columnar sections constructed from surface observations and the records of eleven oil wells situated between Bradford in McKean County and Ridgway in Elk County showing the relation of the lower caboniferous coal beds to the Bradford oil producing sand and the thickening of the sub conglomerate rocks
Summary
Public domain scan of a plan, map, diagram, free to use, no copyright restrictions - Picryl description.
Tags
Date
1879 - 1879
Source
New York Public Library
Copyright info
Creative Commons CC0 1.0 Universal Public Domain Dedication ("CCO 1.0 Dedication")