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Alaska
8
Geology
Diary
4
Field notes
4
Nulato Hills
4
United States
4
Western Union Telegraph Expedition (1865-1867)
4
Yukon River
4
Archaeology
2
Arctic
2
Botany
2
Flora
2
Fort Yukon
2
Fossils
2
Gold mines and mining
2
Illustrations
2
Koyukon Indians
2
Koyukuk Mountain
2
Methods and Techniques
2
Natural history
2
Ornithology
2
Palaeontology
2
Plants
2
Pleistocene
2
Quaternary
2
Stratigraphy
2
Vegetation
2
Water-supply
2
Yukon Territory
2
Yukon-Tanana region
2
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