| 其他書名 | 1. Trends in Canadian Population, Presentation by Dr. Nathan Keyfitz and Mr. Jacques Henripin; 2. Population Trends in Mexico, Presentation by Dr. Nathan L. Whetten |
| 出版 | U.S. Government Printing Office, 1963 |
| URL | http://books.google.com.hk/books?id=Yho0nwEACAAJ&hl=&source=gbs_api |