Julia Morgan-related collections at California repositories
History Center of San Luis Obispo
The San Luis Obispo History Center holds the George Loorz Papers, building contractor at Hearst Castle. Contact the History Center to learn more about their collections: https://historycenterslo.org/about/administration/
UC Berkeley
The Bancroft Library and Environmental Design Archives at Berkeley hold major collections of Morgan materials. Find them on the Online Archive of California.