| Heinrich Kühn Portrait - Meine Mutter [Camera Work, no. 33, pl. 02] 1906 (taken) 1911 (photogravure) Photogravure 7 13/16 × 5 13/16 ins (19.8 × 14.7 cm) (image) 8 × 6 ins (20.3 × 15.2 cm) (sheet) Philadelphia Museum of Art From the Collection of Dorothy Norman, 1973, Accession Number: 1973-267-222 LL/71936
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