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  1. Basic Information about Landfill Gas | US EPA

  2. Landfill gas - Wikipedia

  3. Frequent Questions about Landfill Gas | US EPA

  4. ATSDR - Landfill Gas Primer - Chapter 2: Landfill Gas Basics

  5. Key Information about Landfill Gas and LMOP | US EPA

  6. Basic Information about Landfill Gas | Landfill Methane ...

  7. Biogas-Renewable natural gas - U.S. Energy Information ...