| 000 | 00369nam a2200133Ia 4500 | ||
|---|---|---|---|
| 008 | 130223s9999 xx 000 0 und d | ||
| 100 | _aHeady, E.O. | ||
| 245 | _aProduction functions and methods of specifying optimum fertilizer use under vari | ||
| 260 | _aIowa | ||
| 260 | _c1966 | ||
| 440 | _aNo. 518; Iowa Agricultural and | ||
| 901 | _pS7934 | ||
| 942 |
_cB _2udc |
||
| 999 |
_c130704 _d130704 |
||