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Mimeograph of typescript.
Pamphlet.
Mimeograph of typescript. "Presented before the joint spring meeting of the West Virginia Coal Mining Institute and the Central Appalachian Section, AIME, at Charleston, West Virginia, April 18 and 19, 1969."
Serial. Printed Ephemera Collection has: v.4:no.1 (1969:Oct.)-v.4:no.4 (1970:June), v.5:no.1 (1970:Sept.)-v.5:no.7 (1972:May), v.6:no.7 (1972:Dec.), v.6:no.9 (1973:June)-v.6:no.10 (1973:Oct.), v.7:no.1 (1974:Apr.)-v.7:no.3 (1974:autumn), 1975:spring).