Soil conservation
Kohnke, Helmut
Soil conservation [Text] Kohnke, Helmut - New York McGraw Hill 1959 - vii,298 p. ill., plates, maps 23 cm.
Agriculture
631.4 / KOH
Soil conservation [Text] Kohnke, Helmut - New York McGraw Hill 1959 - vii,298 p. ill., plates, maps 23 cm.
Agriculture
631.4 / KOH