Catalog Record: A study of roof in Pennsylvania mines contiguous to Monongahela River | Hathi Trust Digital Library

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A study of roof in Pennsylvania mines contiguous to Monongahela River / by J.W. Paul and J.G. Calverley.

Main Author: Paul, James Washington.
Other Authors: Calverley, J. G.
Language(s): English
Published: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1933.
Subjects: Coal mines and mining > Pennsylvania > Pittsburgh.
Note: "Third paper on groups of representative mines in Pittsburgh coal bed in Western Pennsylvania."
Physical Description: 31 p. : illus., maps ; 23 cm.
Original Format: Book
Locate a Print Version: Find in a library
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