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1
Report of a reconnaissance of the Yukon River, Alaska Territory. July to September, 1869. By Captain Charles W. Raymond, Corps of Engineers, U.S. Army.
Published 1871Online Access
Government Document Electronic eBook -
2
The coal resources of the Yukon, Alaska by Arthur J. Collier. [U.S. Geological Survey Bulletin No. 218. Series A, Economic Geology, 26.]
Published 1903Online Access
Government Document Electronic eBook