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USDA. NAL. Water and Agriculture Information Center.
A collection of bibliographies, links to online documents and external links to information about environmental aspects of water resources and agriculture including Manure Management, Pest Management and Precision Agriculture.
National Center for Appropriate Technology. ATTRA - National Sustainable Agriculture Information Service.
Publications and other resources on how to assess, improve and maintain soil health for both croplands and pastures.
Environmental Protection Agency.
Encourages the use of methane recovery/biogas technologies at confined animal feeding operations that manage manure as liquids or slurries. This site includes basic technology overview, program accomplishments, experts, publications and technical tools, workshops and conferences and a guide to currently operating systems.