| 000 | 00411nam a2200169Ia 4500 | ||
|---|---|---|---|
| 008 | 140317s9999 xx 000 0 und d | ||
| 082 | _a631 | ||
| 100 | _aCook,G.W. | ||
| 245 | _aAgricultural efficiency. | ||
| 260 |
_aLondon _bRoyal Society _c1977 |
||
| 300 | _a227 | ||
| 650 | _aAgriculture | ||
| 653 | _aAgricultural Efficiency | ||
| 653 | _aAgriculture | ||
| 653 | _aCrop Production | ||
| 942 |
_2ddc _cBK |
||
| 999 |
_c11259 _d11259 |
||