Heinrich harder (1858 – 1935) mural of ammonites (an extinct group of marine invertebrate animals in the subclass ammonoidea of the class cephalopoda) at the berlin aquarium. Painted between 1913 and 1915. Heinrich harder (2 june 1858 putzar – 5 february 1935 berlin) was a german artist and an art professor at the prussian academy of arts in berlin.
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