| 其他書名 | National Symposium on Wild, Scenic and Recreational Waterways, St. Paul, Minnesota, September 10-12, 1970 |
| 出版 | U.S. Bureau of Outdoor Recreation, 1970 |
| URL | http://books.google.com.hk/books?id=QEpEAAAAYAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |