| Edward Steichen Experiment in Three-Color Photography [Camera Work, no. 15, pl. 07] 1906 Three color relief halftone 4 1/4 × 4 13/16 ins (10.8 × 12.3 cm) (image and sheet) Philadelphia Museum of Art Gift of Carl Zigrosser, 1966, Accession Number: 1966-205-15(7) LL/72184
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