Bob Marshall, Part II: Exploring the Koyukuk.
Paton
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BC
University of Colorado Health Sciences Center, Denver, USA.
D000413:Alaska; D005101:Expeditions / Q000266:history*; D016468:Forestry / Q000266:history; D005618:Fresh Water; D049673:History, 20th Century; D006801:Humans; D009051:Mountaineering / Q000266:history*