| 其他書名 | United States International Environmental Referral Center : National Focal Point of the United Nations Environment Program/International Referral System |
| 出版 | Environmental Protection Agency, Office of Administration, Assistant Administrator for Planning and Management, 1976 |
| URL | http://books.google.com.hk/books?id=uhCdvAEACAAJ&hl=&source=gbs_api |