共 4 条
[1]
Howell, 1948, USDA TECHNICAL B, V971
[2]
MEHL JM, 1931, 151 USDA, P22
[3]
STEWART B, 1949, USDA TECHNICAL B, V1001, P58
[4]
STOKES DR, 1947, USDA TECHNICAL B, V934, P12