http://pec.lib.wvu.edu/record/P4386[1969?]A Technical evaluation of the WVU-OCR process for producing flyash-based structural materials. Serial issue. Issued as: West Virginia University. Coal Research Bureau. <em>Technical report</em>, no. 40.<br />Cockrell, Charles F.Shafer, Harry E., 1937-Building materials.Fly ash.14256