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| | 04/25/2004 | Earth Observation Summit II | |
| | 04/14/2004 | The Clean Air Rules of 2004: The Next Chapter in America’s Commitment to Clean Air | |
| | 04/14/2004 | Extracto del discurso -- Las Reglas de Aire Limpio de 2004: El próximo capítulo del compromiso estadounidense hacia el aire limpio | |
| | 04/05/2004 | "It's Our Environment Too": Remarks to the National Hispanic Sustainable Energy and Environmental Conference in Albuquerque, New Mexico | |
| | 04/01/2004 | "Clean Air Rules of 2004 Oral Testimony": Testimony as prepared for delivery before the U.S. Senate Committee on Environment and Public Works, Subcommittee on Clean Air, Climate and Nuclear Safety | |
| | 04/01/2004 | "Clean Air Rules of 2004 Written Testimony": Testimony delivered to the U.S. Senate Committee on Environment and Public Works, Subcommittee on Clean Air, Climate and Nuclear Safety | |
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