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John Muir
20
naturalist
20
writing
California
18
author
18
correspondence
18
correspondent
18
epistle
18
exchange of letters
18
letters
18
mail
18
message
18
missive
18
notes
18
post
18
Environmentalist
2
annotation
2
conservation
2
history
2
journal articles
2
national parks
2
pamphlets
2
speeches
2
travel
2
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