Soil conservation
Kohnke, Helmut
Soil conservation Helmut Kohnke and Anson R. Bertrand - New York McGraw-Hill 1959 - vii, 219p.; ill.; 23cm.- - McGraw-Hill publications in the agricultural sciences; no.20 .
581.5 / KOH
Soil conservation Helmut Kohnke and Anson R. Bertrand - New York McGraw-Hill 1959 - vii, 219p.; ill.; 23cm.- - McGraw-Hill publications in the agricultural sciences; no.20 .
581.5 / KOH