共 26 条
[21]
YOUNG J. L., 1964, SOIL SCI SOC AMER PROC, V28, P377
[22]
1978, CANADIAN SYSTEM SOIL
[23]
1972, USDA1 SOIL SURV INV
[24]
1951, AGR HDB USDA, V18
[25]
1962, AGR HDB USDA, V18, P173
[26]
1975, USDA HDB, V436