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Wilderness Conference
Concert Poster psychedelic art designed by the artist
Stanley Mouse, sometimes in collaboration with Alton Kelley. It promoted the 10th Biennial Wilderness Conference, which was sponsored by the Sierra Club and held at the San Francisco Hilton Hotel from April 7-9, 1967.
Poster Details

Artists: Stanley Mouse and Alton Kelley (Mouse Studios)
Event: 10th Biennial Wilderness Conference
Sponsor: The Sierra Club
Date & Location: April 7-9, 1967, at the San Francisco Hilton Hotel
Central Image: A Native American man on horseback, which was based on a 1908 statue by Cyrus Dallin called "Appeal to the Great Spirit".
Printing Variants: The poster was printed in at least three versions. The one in your image, with the black, green, and yellow background, is often considered the first printing.
Wilderness Conference (Poster)