| 其他書名 | Their Comparative Efficiencies and Effects on Prices and Producers' Returns |
| 出版 | U.S. Department of Agriculture, Production and Marketing Administration, 1953 |
| URL | http://books.google.com.hk/books?id=X34wAAAAYAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |