共 10 条
[1]
BRADLEY WF, 1945, AM MINERAL, V30, P704
[4]
HASEMAN JF, 1945, MISSOURI AGR EXPT ST, V387
[5]
KERR PF, 1948, AM MINERAL, V33, P387
[9]
PEECH M, 1947, USDA757 CIRC
[10]
STEVENS RE, 1934, A185 US GEOL SURV PR