Historical Data. NASS (USDA National Agricultural Statistics Service)
Historical Data [link]Paper  bibtex   
@misc{nass_usda_national_agricultural_statistics_service_historical_nodate,
	title = {Historical {Data}},
	url = {http://www.nass.usda.gov/Statistics_by_State/California/Historical_Data/},
	urldate = {2012-07-01},
	author = {{NASS (USDA National Agricultural Statistics Service)}}
}
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