Economic benefits of systematic roof bolting in Ziegler No. 3 Mine, Bell & Zoller Coal & Mining Co., Williamson County, Ill., / by L.W. Kelly.

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Main Author: Kelly, L. W.
Corporate Author: United States. Bureau of Mines
Format: Government Document Book
Language:English
Published: [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1952.
Series:Information circular (United States. Bureau of Mines) ; 7633.
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Call Number: I 28.27:7626-7650
I 28.27:7626-7650 Available Place a Hold

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