Journal article reprint from: Journal of the American Society of Agronomy, v.28:no.12 (1936:Dec.).
Serial issue. Issued as: West Virginia University. Agricultural Experiment Station. Mimeograph circular, no. 24 (1937:Apr.)
Serial issue. Issued as: West Virginia University. Agricultural Experiment Station. Mimeograph circular, no. 28 (1938:Mar.).
Serial issue. Issued as: West Virignia University. Agricultural Experiment Station. Mimeograph circular, no. 33 (1939:Jan.).