共 7 条
[2]
ANDREWS DJ, 1970, 121 SAM RES B
[3]
BUNTING AH, 1968, NATURAL RESOURCES RE, V7, P101
[5]
CURTIS DL, 1967, EXP AGR, V3, P263
[7]
KOWAL JM, 1972, AGROCLIMATICAL ATLAS