Bekker, David (b.1940). "Robert Koch".

Colour etched portrait, 34,8x28,2 cm., signed "DBekker 90", titled, "10/12", "e/a" in pencil. - AND 5 other similar portraits by the same of famous scientists (Roentgen, Curie, Fleming, Pavlow and Pasteur) and a smaller portrait of Friedrich Wilhelm Raiffeisen.