| 000 | 00453 a2200133 4500 | ||
|---|---|---|---|
| 100 | 1 | _aHeady, E.O. | |
| 245 | 1 | _aCombinations of rotations and fertilization to maximize crop profits on farms in North-Central Iowa (An application of linear programming) | |
| 260 |
_aAmes _c1956 |
||
| 300 | _a755-775 p. | ||
| 440 | _aIowa Agricultural Experiment Station. Research Bulletin No. 439 | ||
| 650 | _aFertilization, Crop | ||
| 942 |
_2udc _cB |
||
| 901 | _a50810 | ||
| 999 |
_c55753 _d55753 |
||