Troeh, Frederick, R.
Soil and water conservation for productivitiy and environmental protection - New Jersey Prentice Hall 1980 - 718 p.
0138221553
Soil conservation, Water conservation, Soil erosion
631.4 T79S
Soil and water conservation for productivitiy and environmental protection - New Jersey Prentice Hall 1980 - 718 p.
0138221553
Soil conservation, Water conservation, Soil erosion
631.4 T79S