by Turner, Frederick.
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The father of American conservation : George Bird Grinnell, adventurer, activist, and author
The invention of nature : Alexander von Humboldt's new world
A passion for nature : the life of John Muir
Wild things, wild places : adventurous tales of wildlife and conservation on planet Earth
Beloved beasts : fighting for life in an age of extinction
Bird girl : Gene Stratton-Porter shares her love of nature with the world
Guardians of the valley : John Muir and the friendship that saved Yosemite
Aldo Leopold : a fierce green fire
English
Muir, John, > 1838-1914.
Naturalists.