Soil conservation
Kohnke, Helmut.
Soil conservation Helmut Kohnke, Anson R. Bertrand. - New York McGraw-Hill c1959. - vii, 298 p. ill., tables. 24 cm.
Includes index.
59008545
Soil conservation.
Soil conservation Helmut Kohnke, Anson R. Bertrand. - New York McGraw-Hill c1959. - vii, 298 p. ill., tables. 24 cm.
Includes index.
59008545
Soil conservation.