Topic
Description and travel
31
Alaska
30
(1837-1840)
29
Antarctica
29
Astrolabe Expedition
29
Oceania
29
Scientific Expeditions
29
Zélée (Frigate)
29
Field notes
24
United States
18
Aleutian Islands
14
United States Coast and Geodetic Survey
12
Diary
8
Geology
8
Mollusks
8
Natural history
8
(1913-1918)
6
Arctic regions
6
Canadian Arctic Expedition
6
Western Union Telegraph Expedition (1865-1867)
6
Bering Sea
4
California
4
Indians of North America
4
Kiska Island
4
Nulato Hills
4
Ornithology
4
Paleontology
4
Sitka
4
Unalaska
4
Yukon River
4
1681-1741
2
1733-1743)
2
Aleuts
2
Amaknak Island
2
Amchitka Island
2
Arctic Ocean
2
Atka
2
Attu Island
2
Augustine Island
2
Baranof Island
2
Barrow
2
Bering
2
Bering River
2
Bering Straits
2
Bogoslof Island
2
Cape Cheerful
2
Cephalopoda
2
Crustacea
2
Delarof Harbor
2
Discovery and exploration
2
more ...