This primary source comes from the Records of the Bureau of Public Roads.
Full Citation: San Francisco, California; ca. 1846-1847; States - California, 1896 - 1963; Historical Photograph Files, 1896 - 1963; Records of the Bureau of Public Roads, Record Group 30; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/san-francisco-california-1846-1847, May 15, 2024]