Kohnke, Helmut,
Soil conservation - New York : McGraw-Hill, c1959. - vii, 298 p. : ill. ; 24 cm.
59008545
Soil conservation.
S623 / .K56
631.45 / KOS
Soil conservation - New York : McGraw-Hill, c1959. - vii, 298 p. : ill. ; 24 cm.
59008545
Soil conservation.
S623 / .K56
631.45 / KOS