Progress report :
experiments on strength of small pillars of coal in the Pittsburgh bed /
by H.P. Greenwald, H.C. Howarth, and Irving Hartmann.

Description

Main Author

Greenwald, H. P. (Harold Putnam), 1893-

Related Names

Hartmann, Irving.
Howarth, H. C.

Language(s)

English

Published

[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1941.

Subjects

Coal mines and mining > Coal mines and mining / Pennsylvania > Coal mines and mining / Pennsylvania / Pittsburgh.

Physical Description

6 p. : ill. ; 27cm.

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