Columbia subject headings:
Harvard subject headings:
Alaska--Description and travel
Alaska--Discovery and exploration--American.
Allen, Henry T. (Henry Tureman), 1859-1930
America--Discovery and exploration.
Copper River Region (Alaska)--Description and travel.
Koyukuk River Region (Alaska)--Description and travel.
Tanana River Region (Alaska)--Description and travel.
Princeton subject headings:
Alaska--Description and travel.
Allen, Henry T. (Henry Trueman), 1859-1930.
Copper River Region (Alaska)--Description and travel.
Koyukuk River Region (Alaska)--Description and travel.
Tanana River Region (Alaska)--Description and travel.
United States--Exploring expeditions.