Butler, M.D. Conserving soil/ M.D. Butler - East west ed. - New Jersey: D. Van Nostrand, 1964 - x, 321 p.: ill., map; 23 cm. Includes index ISBN: RS. 6.00 Subjects--Topical Terms: Soil conservationSoil managementWateshedsSoil--Composition Dewey Class. No.: 631.45