| 其他書名 | Irrigation, Drainage and Conservation Investments Since 1900 |
| 出版 | Natural Resource Economics Division, Economics, Statistics, and Cooperatives Service, U. S. Department of Agriculture, 1979 |
| URL | http://books.google.com.hk/books?id=vSk9AAAAYAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |