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John Muir
12
naturalist
12
correspondence
10
letters
10
Environmentalist
8
conservation
8
history
8
national parks
8
travel
8
writing
6
California
4
author
4
correspondent
4
epistle
4
exchange of letters
4
mail
4
message
4
missive
4
notes
4
post
4
annotation
2
journal articles
2
pamphlets
2
speeches
2
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