共 23 条
- [2] BUSHNELL J, 1925, MINNESOTA STA B, V34
- [3] COBLENTZ WW, 1926, 539 BUR STAND
- [4] Garner WW, 1923, J AGRIC RES, V23, P0871
- [5] Garner WW, 1925, J AGRIC RES, V31, P0555
- [6] Garner WW., 1920, J AGR RES, VXVII, P553
- [8] HOOKER HD, 1922, RES B MISSOURI AGR E, V50
- [9] HOOKER HD, 1921, RES B MISSOURI AGR E, V47
- [10] KIMBALL H.H., 1924, MON WEATHER REV, V52, P473