Using and managing soils / A. F. Gustafson. Gustafson, A. F. (Axel Ferdinand), 1880-1942. Soils. Fertilizers. S591 .G92 631.4 GUU "List of visual aids": p. 399-405. Includes bibliographical references and index. New York : McGraw-Hill Book Co., 1948. 1948. 1948 Text xi, 420 p. : eng McGraw-Hill rural activities series