| 其他書名 | Prepared for the Planning and Research Council of the Greater Saint Paul Community Chest and Council, Inc. by the Amherst H. Wilder Department of Research and Statistics |
| 出版 | The Department, 1950 |
| URL | http://books.google.com.hk/books?id=YSwRAQAAMAAJ&hl=&source=gbs_api |