Map of Alaska showing explorations by U.S. Geological Survey in 1898 together with principal previous routes of exploration [cartographic material] .

Map of Alaska showing the 1898 U.S. Geological Survey expedition routes and previous routes with relief shown by hachures. Depth shown by soundings.; In upper left margin: U.S. Geological Survey Charles D. Walcott, Director.; "Map 1".; In upper right margin: Report, Public Resolution No. 25, 55th Congress 3D Session.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-rm1539