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"Ag 101: Demographics". U.S. Environmental Protection Agency. September 10, 2009. Archived from the original on September 24, 2015. Retrieved April 3, 2012.
"Fruit and Nut Crops (California)"(PDF). USDA National Agriculture Statistics Service. October 28, 2011. Archived(PDF) from the original on March 4, 2016. Retrieved April 6, 2012.
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