| 其他書名 | From a Study Conducted July 1, 1959-June 30, 1961 |
| 出版 | U.S. Department of Health, Education, and Welfare, Public Health Service, Division of Water Supply and Pollution Control, 1962 |
| URL | http://books.google.com.hk/books?id=Gj1S3tCShZEC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |