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Methods of excavation and roof support used in some recently constructed tunnels /

Polack, S. P.

Publication date

January 1950

Publisher

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

Abstract

" ... the personnel of the Corps of Engineers, U.S. Army, Pittsburgh district ..."--Acknowledgment, p. 2.Mode of access: Internet

Extracted data

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