Future sources of power
By: by George H. Ashley
Contributors: Pennsylvania. Bureau of Topographic and Geologic Survey
Series: Bulletin -- no. 14
Publisher: Bureau of Topographic and Geological Survey
Published: 1920
Place of publication: [Harrisburg]
Language: eng
Subjects: Power resources
Notes: Pa. State Docs. class. no. PY G345/4.17/8:no. 14.

Typescript.

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

November 24, 1920.