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1961
1
Fossil -- Bering Land Bridge
1
Fossil -- Panama -- Panama
1
Isthmus of
1
Mammals
1
Paleontology -- Bering Land Bridge
1
Paleontology -- Panama -- Panama
1
Paleontology -- Pleistocene -- America
1
Paleontology -- Pliocene -- Bering Land Bridge
1
Paleontology -- Pliocene -- Panama -- Panama
1
QL1 .A436 no.2044
1
Squirrels
1
Squirrels -- Dispersal -- America
1
Squirrels -- Geographical distribution -- America
1
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