共 20 条
[2]
COOK K, 1982, J SOIL WATER CONSERV, V37, P89
[3]
CROSSON P, 1982, J SOIL WATER CONSERV, V37, P27
[4]
Crosson P.R., 1983, PRODUCTIVITY EFFECTS
[5]
FROHBERG KK, 1976, 161 U ILL AGR EC RES
[6]
Krutilla J.V., 1975, EC NATURAL ENV STUDI
[8]
MIRANOWSKI J, 1983, EFFECT AGR LAND USE
[9]
MONSON MJ, 1982, THESIS IOWA STATE U
[10]
National Research Council (US ), 1981, SURF MIN SOIL COAL S