Soil conservation
Kohnke, Helmut.
Soil conservation - New York : McGraw-Hill, 1959 - 298 p. : ilus. - McGraw-Hill publications in the agricultural sciences . - McGraw-Hill publications in the agricultural sciences .
28558
Suelos--Conservación.
631.45 / K6
Soil conservation - New York : McGraw-Hill, 1959 - 298 p. : ilus. - McGraw-Hill publications in the agricultural sciences . - McGraw-Hill publications in the agricultural sciences .
28558
Suelos--Conservación.
631.45 / K6