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Start Over Subject Gas fields Spatial Coverage Pennsylvania

1. Oil and gas fields of Pennsylvania

Yale Public content
1921. 2010-08-31T18:52:03Z. 2019-03-04T19:01:58Z. Richardson, G. B. U.S. Geological Survey. English. Public. Pennsylvania.

2. Oil and gas fields of western Pennsylvania

Yale Public content
1932. 2010-08-31T18:24:04Z. 2015-10-27T22:25:36Z. Pennsylvania. Bureau of Topographic and Geologic Survey. Topographic and Geologic Survey. English. Public. Pennsylvania.