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- © John Gerrard Keulemans (June 8, 1842, Rotterdam - March 29, 1912); Author: W. Vincent Legge (2 September 1841 – 25 March 1918)
- Copyright licence: Marked as being in the public domain
- Provenance: http://media.eol.org/content/2013/11/30/03/96392_orig.jpg