Ansel Adams (American, 1902–1984), "Twenty Mule Team Canyon, Death Valley, National Monument," circa 1949, gelatin silver print, titled in pen verso, artist stamp "Photograph by Ansel Adams 131 - 24th Avenue, San Francisco," NEG. NO...." inscribed in pencil "I - NP - 6 85," and stamped "PROOF not to be used for Reproduction or Display," verso, overall (sheet/unframed): 8"h x 10"w.