Soil conservation /
Kohnke, Helmut.
Soil conservation / Helmut Kohnke & Anson R. Bertrand. - New York : McGraw- Hill, 1959. - vii, 298 pages : illustrations ; 24 cm.
Includes bibliographical references.
Soil conservation.
Soil conservation / Helmut Kohnke & Anson R. Bertrand. - New York : McGraw- Hill, 1959. - vii, 298 pages : illustrations ; 24 cm.
Includes bibliographical references.
Soil conservation.