John Muir in 1872

John Muir (1838-1914) was a Scottish-born American environmental activist, naturalist, author, and founder of the Sierra Club. Muir’s writings about the Sierra Nevada Mountains, including his autobiographical My First Summer in the Sierra, are still widely read and were influential in the creation of Yosemite National Park and the preservation of large swaths of American wilderness.

Additional biographical information: Wikipedia | Encyclopaedia Britannica

HathiTrust: John Muir
The full text of dozens of Muir’s books.

John Muir Papers, Holt-Atherton Special Collections, University of the Pacific,
Includes Muir’s correspondence from 1856 to 1914, Muir’s journals from 1867 to 1913, approximately 250 photographs of Muir, and approximately 400 drawings attributed to Muir.

Sierra Club John Muir Digital Archive
Full text of Muir articles, books, journals, and letters. Also includes an Annotated John Muir Bibliography and Bibliographic Resources.

WorldCat: John Muir
Bibliographic information on Muir holdings in various archives.