| 其他書名 | a case study of soil loss, fertilizer, and land use constraints |
| 出版 | U.S. Department of Agriculture, Economic Research Service, [Natural Resource Economics Division, 1976 |
| URL | http://books.google.com.hk/books?id=_tPZZzPrNBgC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |