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Charles Darwin English naturalist, Feb. 12, 1809 - April 19, 1882.
Detroit : Gale Research, 1968Format: Image
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Carl Linnaeus Swedish naturalist, May 23, 1707 - Jan 10, 1778.
Detroit : Gale Research, 1968Format: Image
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The wilderness world of Sigurd F. Olson
Ely, MN : Listening Point Foundation, Inc., 1983Format: Video
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Henry David Thoreau Amrican naturalist and author, July 12, 1817 - May 6, 1862.
Detroit : Gale Research, 1968Format: Image
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John Muir American naturalist, April 21, 1838 - Dec. 24, 1914.
Detroit : Gale Research, 1968Format: Image
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