共 12 条
- [1] [Anonymous], 1960, OFFICIAL METHODS ANA
- [3] COPPOCK CE, 1968, 89 NEW YORK STAT COL
- [4] FEDERER WT, 1955, EXPERIMENTAL DESIGN
- [6] GOERING HK, 1970, 379 USDA AGR HANDB
- [7] HAYDEN CC, 1923, 369 OH AGR EXP STA B
- [9] NEVENS WB, 1933, 391 ILL AGR EXP STA