of his research contains more than 60,000 volumes, and is now located at the University of California, Berkeley. See also List of National Historic Landmarks in California National Register of Historic Places listings in San Diego County, California References External links Bancroft Ranch House Museum - San Diego History Center History of San Diego County, California National Register of Historic Places in San Diego County, California National Historic Landmarks in California Historic American Buildings Survey in California Houses in San Diego County, California Museums in San Diego County, California Historic house museums in California