Collection of reports of explorations in Alaska, mainly by the US Army. Includes report of Senate Committee on Military Affairs, general introduction, 51 reports and sub-reports on such topics as population and resources, international polar expedition to Point Barrow 1881-1884, relief of the destitute in gold fields 1897, up and down the Yukon, military reconnaissance of the Copper River Valley 1898, Tanana Region 1898, Cook Inlet 1899, winter conditions along the Yukon 1899, military road from Valdez to Copper Center, ethnographical information on native tribes, etc.