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Author/Creator
- United States. Environmental Protection Agency14
- United States13
- United States. Environmental Protection Agency. Office of Research and Development13
- Australian National University. Pacific Manuscripts Bureau8
- United Nations Environment Programme8
- Greenpeace New Zealand7
- United States. Bureau of Land Management7
- Instituto de Derecho Ambiental y Desarrollo Sostenible (Guatemala, Guatemala)6
- United States. Congress. House. Committee on Energy and Commerce6
- United States. Federal Highway Administration6
- Indonesia. Kantor Menteri Negara Kependudukan dan Lingkungan Hidup5
- Indonesia. Kantor Menteri Negara Lingkungan Hidup5
- United Nations Conference on Environment and Development (1992 : Rio de Janeiro, Brazil)5
- United States. Congress. Office of Technology Assessment5
- United States. Congress. Senate. Committee on Foreign Relations5
- Autoridad Nacional del Ambiente (Panama)4
- David Suzuki Foundation4
- Germany. Umweltbundesamt4
- Guatemala. Congreso de la República4
- Hulot, Nicolas4