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1856-1920
1873-1936
1
1875-1946
Academy of Natural Sciences (Philadelphia
1
Archaeology
1
Bartlett
1
Bob
1
Expedition
1
Greenland
1
Harry
1
Houses and homes
1
Indigenous peoples
1
Museums
1
Natural history
1
Pa.)
1
Peary
1
Research
1
Research vessels
1
Robert E. (Robert Edwin)
1
Ships
1
Specimens
Whitney
1
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