This primary source comes from the Records of the Bureau of Public Roads.
National Archives Identifier:
513334Full Citation: San Francisco; ca. 1855; 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-aerial-1855, May 16, 2024]