Rock-dust barriers for coal mines.

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Bibliographic Details
Online Access:	Full Text (via ProQuest)
Other Authors:	Greenwald, H. P. (Harold Putnam), 1893-, Howarth, H. C. (Henry C.), 1879-, Rice, George Samuel, 1866-
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [s.n.], 1930.
Series:	Mines Bur. Rpt. of Investigation No. 2977.
Subjects:	Mineral dusts.

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Call Number:	C22.12-2977
C22.12-2977	Available