San Francisco: Sierra Club, 1968. First. hardcover. 2 volumes. Illustrated throughout with 138 beautiful color photographs by Porter. Introduction by Loren Eiseley and John P. Milton. Edited by Kenneth Brower. Small folio, red cloth, dust wrappers, bumped cloth slipcase. San Francisco: The Sierra Club, 1968. First edition. Near fine copies in very good dust wrappers. near fine / very good.
Volume I: Discovery; Volume II: Prospect.