| 000 | 00350nam a2200133Ia 4500 | ||
|---|---|---|---|
| 008 | 130225s9999 xx 000 0 und d | ||
| 100 | _aHecht, R.W., Barton, G.T. | ||
| 245 | _aGrains in productivity of farm labor | ||
| 260 |
_aWashington _c1950 |
||
| 300 | _a1-121 p. | ||
| 440 | _aUnited States Department of A | ||
| 901 | _a31097 | ||
| 942 |
_cB _2udc |
||
| 999 |
_c6046 _d6046 |
||