共 6 条
- [1] DANIEL DERRILL McCOLLOUGH, 1932, NEW YORK STATE [GENEVA] AGRIC EXP STA TECH BULL, V187, P1
- [3] FLANDERS SE, 1930, CALIFORNIA DEP AGR M, V19, P409
- [4] GRAF JE, 1917, USDA B, V427, P1
- [5] Haeussler GJ, 1932, J AGRIC RES, V45, P0079
- [6] STEARNS LOUIS A., 1928, NEW JERSEY AGRIC EXP STA BULL, V460, P1