This primary source comes from the Records of the Hydrographic Office.
Full Citation: The West Indies, Central America, Gulf of Mexico, and Caribbean Sea; 1915; Published Nautical Charts, 1867 - 1962; Records of the Hydrographic Office, Record Group 37; National Archives at College Park, MD. [Online Version, https://www.docsteach.org/documents/document/west-indies-central-america-gulf-of-mexico-and-caribbean-sea, December 6, 2024]