Effects of testing variables on the measured compressive strength of high-strength (90 MPa) concrete /

Mode of access: Internet.

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."

Effect of mortar properties on strength of masonry /

"Issued November 20, 1961."