Columbia subject headings:
Mackenzie River (N.W.T.)
Northwest, Canadian--Description and travel.
Yukon River Valley (Yukon and Alaska)--Description and travel.
Harvard subject headings:
Mackenzie River (N.W.T.)
Northwest, Canadian--Description and travel.
Yukon River Valley (Yukon and Alaska)--Description and travel.
Princeton subject headings:
Mackenzie River (N.W.T.)
Northwest, Canadian--Description and travel.
Yukon River and Valley--Description and travel.