| 000 | 00336 am a2200121 a 4500 | ||
|---|---|---|---|
| 100 | 1 |
_a _d |
|
| 245 | 1 | _aImportant of maintaining a supply of humus in the soil | |
| 260 |
_aWashington _c1898 |
||
| 300 | _a1-32 p. | ||
| 942 |
_2udc _cB |
||
| 440 | _aSoil United States Department of Agriculture. Farmers Bulletin No. 78 | ||
| 901 | _aS48864 | ||
| 999 |
_c104987 _d104987 |
||