Bertrand, Anson Rabb
Soil conservation / Helmut Kohnke and Anson Rabb Bertrand - New York : McGraw-Hill, c1959. - vii, 208 p ill., tab. 24 cm.
Soil conservation / Helmut Kohnke and Anson Rabb Bertrand - New York : McGraw-Hill, c1959. - vii, 208 p ill., tab. 24 cm.