Robert Engberg has studied Muir's life for some thirty years. He is coeditor of John Muir to Yosemite and Beyond and John Muir Summering in the Sierra.
Robert Engberg
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Robert Engberg has studied Muir's life for some thirty years. He is coeditor of John Muir to Yosemite and Beyond and John Muir Summering in the Sierra.
