Salmon, S. C. 1885-1975. The principles and practice of agricultural research / S. C. Salmon and A. A. Hanson. - London : L. Hill, 1964. - xi, 384 p. : illus. ; 26 cm. 336 336 LCCN: 66001629 Subjects--Topical Terms: Research--Agricultural. Dewey Class. No.: 630.72 / S35p