In 1896, the U.S. Geological Survey sent three recent Harvard graduates, J.E. Spurr, H.B. Goodrich and F. C. Schrader, to Alaska to investigate the gold fields.  This was to be a two summer project however they encountered the Alaskan mosquito and managed to complete the work in one year.  This map is found on page 340 of the Eighteenth Annual Report of the United States Geological Survey (1896-7) published in 1898.  A  larger  version is available for downloading in a new window.