http://pec.lib.wvu.edu/record/P3755undatedDeep bed drying of fine coal with the aid of ultrasonics.Serial issue. Issued as: West Virginia University. Coal Research Bureau. <em>Report</em>, no.99. "Presented at the 1973 Ultrasonics Symposium, November 5-7, 1973, Monterey, California and published in the <em>Proceedings</em> of the Symposium."Fairbanks, Harold Vincent, 1915-Coal preparation.14256