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Economics Advisory Board） 农业网络信息中心（英语：Agriculture Network Information Center） 农业和海外农业服务副部长（英语：Under Secretary of Agriculture for Farm and Foreign Agricultural
Resources Information Network (GRIN). USDA. Ungnadia Endl.. Germplasm Resources Information Network. United States Department of Agriculture. 2006-03-29
Prosopis glandulosa Torr.. Germplasm Resources Information Network. United States Department of Agriculture. 1997-05-22 [2010-01-01]. （原始内容存档于2009-08-14）
arboreus". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2010-03-23
Association El Pilar Forest Garden Network, information on traditional Maya forest gardening National Agroforestry Center (USDA) Agroforestry Practices