| Tag | Indicator | Content |
|---|---|---|
| 020 | ## | $a0-12-656550-3 |
| 041 | ## | $aEnglish |
| 082 | ## | $a630 |
| 100 | 0# | $aC. R. W. Spedding |
| 245 | 04 | $aThe biology of agricultural systems |
| 260 | ## | $aNew York $bAcademic $c1975 |
| 300 | ## | $aix, 261 p. $bfig., table $c24 cm |
| 500 | ## | $aIncludes index. |
| 650 | 00 | $aAGRICULTURE |