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SANTA ROSA, CA - JUNE 18: A large tract of mobile homes just to the south of the city encroaches on nearby vineyard and farmland on June 18, 2014, near Santa Rosa, California. Sonoma County in recent years has grown its wine industry into the second most important California wine region, behind Napa Valley. (Photo by George Rose/Getty Images)

SANTA ROSA, CA - JUNE 18:  A large tract of mobile homes just to the south of the city encroaches on nearby vineyard and farmland on June 18, 2014, near Santa Rosa, California. Sonoma County in recent years has grown its wine industry into the second most important California wine region, behind Napa Valley. (Photo by George Rose/Getty Images)