共 9 条
[1]
BAKER WA, 1948, USDA FARMERS B, V1548
[2]
CAFFREY DJ, 1927, USDA DEP B, V1476, P10
[3]
HERVEY GER, 1932, NY STATE AGR EXPT ST, V603, P22
[4]
HUBER LL, 1928, OHIO AGR EXPT STA B, V429, P50
[5]
LATHROP FH, 1948, MAINE AGR EXPT STA B, V457, P346
[6]
LOZINALOZINSKII LK, 1935, REV APPL ENT A, V23, P564
[7]
MAIL GA, 1930, J AGR RES, V41, P550
[8]
PEPPER BB, 1944, NJ AGR EXPT STA CIRC, V486, P8
[9]
TURNER N, 1945, CONN AGR EXPT STA B, V495, P27