| August Sander Rüdesheimer Keller 1920s (late) Gelatin silver print 16 x 12 cm Bassenge Photography Auctions Auction (17 June 2009, Sale 93, Lot 4546), © Die Photographische Sammlung/SK Stiftung Kultur - August Sander Archiv, Köln; VG-Bild Kunst, Bonn, 2011 LL/32536 Annotated in pencil, photographer's/copyright stamp and typed paper label for unknown publication affixed to left edge on the verso.
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