| ID | 259149 |
| Call Number | X9J:8.7375/F9/039929 |
| Title Proper | Crop system in Iowa county |
| Language | ENG |
| Author | Hopkins, J.A. Jr. |
| Publication | Ames, Iowa Agricultural Experiment Station, 1929. |
| Description | 38p |
| Series | Bulletin No. 261 |
| Price. Qualification | -- |
| Classification Number | X9J:8.7375 |