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Tuolumne County Historical Society California History Welcome to the Tuolumne County Historical Society Our Mission shall be to discover collect preserve and disseminate knowledge about the history of Tuolumne County and the State of California. Museum HoursSunday CLOSEDMonday CLOSEDTuesday 10am4pmWednesday 1pm4pmThursday 10am4pmFriday 10am330pmSaturday 10am330pm The Tuolumne County Historical Society was established in 1956 to preserve protect and perpetuate the colorful history of one of Californias original counties. The Tuolumne County Historical Society the Tuolumne County Museum and History Research Center and the Tuolumne County Genealogical Society provide resources to serve and inform scholars local residents and visitors with information on this areas rich history. The Tuolumne County History Collection is a large volume of historical information consisting of the memories and images of Tuolumne Gold Rush through modern times.