| 其他書名 | Some of the Economic Implications of the Proposed Apostle Islands National Lakeshore |
| 出版 | University of Wisconsin, School of Commerce, Bureau of Business Research & Service, Center for Research on Tourism, 1965 |
| URL | http://books.google.com.hk/books?id=8L0sAQAAMAAJ&hl=&source=gbs_api |