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history
Environmentalist
10
John Muir
10
conservation
10
national parks
10
naturalist
10
travel
10
correspondence
6
letters
6
annotation
4
journal articles
4
pamphlets
4
speeches
4
writing
4
last glacial maximum
1
luminescence
1
marginal zone
1
northern eurasia
1
pleistocene
1
sediments
1
siberia
1
taymyr peninsula
1
western yamal peninsula
1
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