Geology of oil and gas in relation to coal
By: by George H. Ashley
Contributors: Pennsylvania. Bureau of Topographic and Geologic Survey
Series: Bulletin -- no. 16
Publisher: Bureau of Topographic and Geological Survey
Published: 1920
Place of publication: [Harrisburg]
Language: eng
Subjects: Petroleum; Natural gas; Coal mines and mining
Notes: Pa. State Docs. class. no. PY G345/4.17/8:no. 16.

Typescript.

At head of title: Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey.

December 1, 1920.