| 其他書名 | Figures from the Same Farms for a Series of Years : Washington County, Ohio, 25 Farms, 1912-1918 ; Clinton County, Ind., 100 Farms, 1910 and 1913-1918 ; Dane County, Wis., 60 Farms, 1913-1917 |
| 出版 | U.S. Department of Agriculture, 1920 |
| URL | http://books.google.com.hk/books?id=RHFCAQAAMAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |