| 000 | 00400nam a2200133Ia 4500 | ||
|---|---|---|---|
| 008 | 130225s9999 xx 000 0 und d | ||
| 100 | _aMartin, W.P., Walker, R.H., Brown, P.E. | ||
| 245 | _aOccurrence of azotobactor in Iowa soils and factors affecting thier distribution | ||
| 260 |
_aAmes _c1937 |
||
| 300 | _a227-256 p. | ||
| 440 | _aIowa Agricultural Experiment | ||
| 901 | _a3089 | ||
| 942 |
_cB _2udc |
||
| 999 |
_c632 _d632 |
||