| Summary: | Scales differ Relief shown by contours, hachures and spot heights. Depths shown by soundings and isolines. Title from Map 1. Map 1 overprinted in red to highlight routes of members of the U.S. Geological Survey in 1898 and principal previous routes of exploration. "The base is a copy of a portion of chart T of the U.S. Coast and Geodetic Survey"--Map 1 Map 10, Alaska Fortymile quadrangle, in standard topographic quadrangle colors (black, brown, and blue). To accompany: "Report. Public resolution no. 25, 55th Congress, 3d session"--Upper right margins. Separated from: Maps and descriptions of routes of exploration in Alaska in 1898. / U.S. Geological Survey. Washington, D.C. : Printed in the Engraving and Printing Division of the United States Geological Survey,1899. (Document / 55th Congress, 3d session, Senate; no. 172). Map 1. Map of Alaska showing explorations by U.S. Geological Survey in 1898 together with principal previous routes of exploration. Scale 1:3,600,000 -- Map 2. Explorations in Alaska, 1898 : Sushitna River and adjacent territory. Scale 1:625,000 -- Map 3. Explorations in Alaska 1898 : Headwaters of Skwentna and Kuskokwim rivers and vicinity of Katmai. Scale 1:625,000 -- Map 4. Explorations in Alaska 1898 : Middle Kuskokwim River and part of Bristol Bay. Scale 1:625,000 -- Map 5. Explorations in Alaska 1898 : Lower Kuskokwim River, Kanektok River, and Togiak Bay. Scale 1:625,000 -- Map 6. Alaska, route of military expedition . from Knik Arm to Tanana River, 1898. Scale approximately 1:625,000 -- Map 7. Alaska, military expedition . Copper River and adjacent territory, 1898. Scale about 1:376,000 -- Map 8. Alaska military expedition . Prince William Sound and vicinity, 1898. Scale about 1:376,000 -- Map 9. Explorations in Alaska, 1898 : portions of Tanana and White Rivers. Scale 1:625,000 -- Map 10. Alaska, Fortymile quadrangle. Scale 1:250,000. Edition of April 1899.
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