| 000 | 00422 a2200133 4500 | ||
|---|---|---|---|
| 100 | 1 | _aHeady, Earl O. | |
| 245 | 1 | _aNew procedures in estimating feed substitution rates and in determining economic efficiency in pork production | |
| 260 |
_aAmes _c1954 |
||
| 300 | _a895-976 p. | ||
| 440 | _aIowa Agricultural Expriment Station. Research Bulletin No. 409 | ||
| 650 | _aFeed, Economic | ||
| 942 |
_2udc _cB |
||
| 901 | _a42282 | ||
| 999 |
_c55723 _d55723 |
||