Heinrich K黨n; gum tree; Staatliche Landesbildstelle Hamburg; collection on the history of photography; silver gelatin paper; cardboard; black and white positive process; image size: height: 38.80 cm; width: 29.80 cm; inscribed: verso cardboard: top left label in typewriter font: Heinrich Kuehn; and more with pencil: Gummibaum; 1929; stamp: verso cardboard: upper left stamp: Lehrsammlung der; Staatlichen Landesbildstelle Hamburg; Inventarisiert Nr. [in ink added: B 195]; artistic photography; plants; vegetation