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Natl Agr Stat Serv, USDA, Res & Dev Div, Room 6412A South Bldg 1400 Independence Ave SW, Washington, DC 20250 USA Natl Agr Stat Serv, USDA, Res & Dev Div, Room 6412A South Bldg 1400 Independence Ave SW, Washington, DC 20250 USA