Columbia subject headings:
Gold mines and mining--Alaska--Koyukuk River.
Koyukuk River (Alaska)--Gold discoveries.
Harvard subject headings:
Gold mines and mining--Alaska--Koyukuk River.
Koyukuk River (Alaska)--Gold discoveries.
Princeton subject headings:
Gold mines and mining--Alaska--Koyukuk River.
Koyukuk River (Alaska)--Gold discoveries.