| 000 | 00521nam a2200169Ia 4500 | ||
|---|---|---|---|
| 008 | 130223s9999 xx 000 0 und d | ||
| 080 | _a633.1(1-77) | ||
| 100 | _aPingali, Prabhu L. and Heisey, Paul W. | ||
| 245 | _aCereal crop productivity in developing countries: past trrends and future prospe | ||
| 260 | _aMexico | ||
| 260 | _bInternational Maize and Wheat Improvement Center; CIMMYT | ||
| 260 | _c1999 | ||
| 300 | _a32p. | ||
| 440 | _aNo99-03; CIMMYT Economics pape | ||
| 901 | _pS44486 | ||
| 942 |
_cB _2udc |
||
| 999 |
_c117564 _d117564 |
||