| 000 | 00414nam a2200133Ia 4500 | ||
|---|---|---|---|
| 008 | 220204s9999 xx 000 0 und d | ||
| 082 |
_a631/635 _bBLA |
||
| 245 | 0 | _aAgronomy in a changing world and research needs for the seventies. | |
| 260 |
_aAmerica _bAmerican Society for Agronomy _c1971 |
||
| 490 | _aASA Special publication; no. 19 | ||
| 650 | _aAgricultural economics | ||
| 700 | _aBLACK, C A | ||
| 942 | _cBK | ||
| 999 |
_c22510 _d22510 |
||