共 17 条
[2]
Anderson MS, 1924, J AGRIC RES, V28, P0927
[3]
BENNETT HH, 1925, 5 ANN M AM SOIL SURV, V1, P69
[4]
BENNETT HH, 1925, J AM SOC AGRON, V17, P318
[5]
CLARKE FW, 1920, US GEOL SURV B, V695
[6]
GILE PL, 1924, USDA B, V1193
[10]
JOSEPH AF, 1924, T CHEM SOC, V125, P1888