Tests of strength of roof supports used in anthracite mines of Pennsylvania : report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission and review of the compressive strength of anthracite, bituminous coals and mine supports
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Tests of strength of roof supports used in anthracite mines of Pennsylvania : report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission and review of the compressive strength of anthracite, bituminous coals and mine supports
（Bulletin / United States Department of Commerce, Bureau of Mines, 303）
U.S.G.P.O., 1929
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注記
Statement of responsibility from under caption title
At head of title: Department of Commerce, R.P. Lamont, secretary, Bureau of Mines, Scott Turner, director
