| 其他書名 | Based on Soil Classification and Acreage Estimates from the National Inventory of Soil and Water Conservation Needs |
| 出版 | U.S. Department of Agriculture, Economic Research Service, Resource Development Economics Division, 1964 |
| URL | http://books.google.com.hk/books?id=LP9_paq6NsMC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |