Future use of raw coal
By: by George H. Ashley
Contributors: Pennsylvania. Bureau of Topographic and Geologic Survey
Edition: Rev. May 25, 1922.
Series: Bulletin -- no. 9
Publisher: Bureau of Topographic and Geological Survey
Published: 1922
Place of publication: [Harrisburg]
Language: eng
Subjects: Coal mines and mining
Notes: Pa. State Docs. class. no. PY G345/4.17/8:no. 9:1922.

Typescript.

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

June, 1920 at head of ℓ. [1]; Revised May 25, 1922 on ℓ. 5.