| 其他書名 | A Study of the Chicago Field Offices of the United States Department of Agriculture |
| 出版 | University of Chicago Press, 1940 |
| 主題 | Technology & Engineering / Agriculture / General |
| ISBN | 05989724719780598972477 |
| URL | http://books.google.com.hk/books?id=HNQcAQAAMAAJ&hl=&source=gbs_api |