Featured Image: Magazine Ad, Schlumberger Sonic Log, 1958; Designed by Elaine Lustig Cohen (American, b. 1927); USA; lithograph on white shiny wove paper; H x W: 28.2 x 21 cm (11 1/8 x 8 1/4 in.); Gift of Tamar Cohen and Dave Slatoff; 1993-31-123

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