United States. Hydrographic Office, and A. Welcker. "The Arctic Ocean between Greenland and Nova Zemla and between the 60th and 82d parallels of latitude." Map. Washington, D.C.: Hydrographic Office, 1888. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:0z709b82r (accessed April 24, 2024).