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naturalists -- united states -- biography

My first summer in the Sierra

By John Reid Muir

A passion for nature ; the life of John Muir

By Donald Worster,Paul "Triple H" Levesque

Henry David Thoreau

By Laura Dassow Walls

The collected works of Sigurd F. Olson

By Sigurd F. Olson

Spencer Fullerton Baird and the U.S. Fish Commission

By Dean C. Allard

John Wesley Powell

By James M. Aton

Ernst Mayr at 100

By

John Muir: life and legacy

By