Kohnke, Helmut 1901- [from old catalog] creator Bertrand, Anson Rabb 1923- [from old catalog] joint author. text New York McGraw-Hill c1959 monographic vii, 298 p. illus., tables. 24 cm. Helmut Kohnke and Anson R. Bertrand Soil conservation S623 .K56 1959 59008545 UOEL 000 20250506101853.0 6545406