This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: Soviet Arctic Selected Resources and Industries (Pre-War); 1948; Published Maps, 1947 - 2015; Records of the Central Intelligence Agency, Record Group 263; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/soviet-arctic-selected-resources-and-industries-prewar, May 8, 2024]