共 11 条
[1]
[Anonymous], 1935, ATLAS AM AGR 3
[2]
[Anonymous], 1860, REPORT GEOLOGY AGR S
[3]
Baldwin M, 1938, USDA YB, P979
[4]
Coffey G. N., 1912, USDA SOILS B, V85
[5]
MARBUT CF, 1922, AM SOIL SURVEY ASS B, V3, P24
[6]
MARBUT CF, 1913, USDA SOILS B, V96
[7]
MARBUT CF, 1921, SOC PROM AGR SCI P, V41
[8]
PETERS R, 1885, GEOLOGICAL SURVEY KE, V2
[9]
SHALER NS, 1891, 12 US GEOL SURV A 11
[10]
WHITNEY M, 1909, USDA SOILS B, V55