Sands, Paul F.
Blind pneumatic stowing in voids in abandoned mines / by P.F. Sands, C.M.K. Boldt, and T.M. Ruff. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1990. - 13 p. : ill. - Information circular ; 9268 . - Information circular (United States. Bureau of Mines) ; 9268. .
90001809
Mine filling.
Compressed air.
Abandoned coal mines.
Blind pneumatic stowing in voids in abandoned mines / by P.F. Sands, C.M.K. Boldt, and T.M. Ruff. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1990. - 13 p. : ill. - Information circular ; 9268 . - Information circular (United States. Bureau of Mines) ; 9268. .
90001809
Mine filling.
Compressed air.
Abandoned coal mines.