| 000 | 00399nam a2200145Ia 4500 | ||
|---|---|---|---|
| 008 | 130223s9999 xx 000 0 und d | ||
| 100 | _aShaffer, H.F. | ||
| 245 | _aBreeding efficiency in your herd : How much rest do cows need after calving? | ||
| 260 | _aPennsylvania | ||
| 260 | _c1961 | ||
| 300 | _a1 sheet | ||
| 440 | _aNo. 235; Pennsylvania Agricult | ||
| 901 | _pS3026 | ||
| 942 |
_cB _2udc |
||
| 999 |
_c117039 _d117039 |
||