This primary source comes from the Records of the Office of the Chief of Engineers.
Full Citation: West Indies Showing Sovereignty of the Various Islands; ca. 1925; West Indies; War Department Map Collection, 1939 - 1942; Records of the Office of the Chief of Engineers, Record Group 77; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/west-indies-showing-sovereignty-various-islands, June 4, 2023]