Coal mine entry intersection behavior study /
Hanna, K.
Coal mine entry intersection behavior study / by K. Hanna, D. Conover, and K. Haramy. - Washington, DC : United States Dept. of the Interior, Bureau of Mines, 1990. - iii, 78 p. : ill. - Report of investigations ; 9337 . - Report of investigations (United States. Bureau of Mines) ; 9337 .
90002477
Shaft sinking.
Rock mechanics.
Coal mine entry intersection behavior study / by K. Hanna, D. Conover, and K. Haramy. - Washington, DC : United States Dept. of the Interior, Bureau of Mines, 1990. - iii, 78 p. : ill. - Report of investigations ; 9337 . - Report of investigations (United States. Bureau of Mines) ; 9337 .
90002477
Shaft sinking.
Rock mechanics.