John Muir seated in Yosemite – Photo taken by Professor Francis M. Fritz in 1907.
Photo from Calisphere –
https://calisphere.org/item/ark:/13030/tf2r29p09b/
from the California Bancroft Library. ID #JM 33. Bancroft Library Photo Duplication Services Unit This photo is presumed by Wikipedia, WikiMedia Commons, Bancroft Library-University of California Berkeley, Project Gutenberg and others to be in the public domain. It is available on Calisphere, WikiMedia Commons, and many other public domain sites. We have not yet located the first publication, but it was likely contemporary to the date of the photograph as specified in 1907.