Fergus, E. N. Field crops management / E. N. Fergus and Carsie Hammonds ; edited by R. W. Gregory. - Rev. ed. - New York : J. B. Lippincott, 1949. - vii, 600 p. ; ill. ; 22 cm. Includes index. 311 311 Subjects--Topical Terms: Agricultural management. Dewey Class. No.: 631.3 / F381f