Welcome to the Kids' Library!

Field-expedient shotcrete adhesion test system

[Pittsburgh, PA] : Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, [2011] 2011

Field-use early-strength shotcrete test system

[Pittsburgh, PA] : Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, [2011] 2011

Geologic factors causing roof instability and methane emission problems the Lower Kittaning coalbed,

McCulloch, C. M. (Charles M.)
[Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, [1973] 1973

Using ground penetrating radar for roof hazard detection in underground mines

[Pittsburgh, Pa.] : U.S. Dept. of Energy, Pittsburgh Research Center, [1996] 1996