Group lot of signed items from European medical pioneers, obtained from the estate of Dr. Ernst Witebsky, a German-American immunologist. Lot includes: a signed photo of Hans Sachs (head of the Kaiser Wilhelm Institute); an ALS on a postcard from German neurologist Ludwig Edinger; a postcard signed by Austrian immunologist and 1930 Nobel Prize winner Karl Landsteiner; two ALSs on postcards from Danish microbiologist Thorvald Madsen; an ALS on a postcard from Ludolf von Krehl; a TLS on a postcard from German botanist Carl Christian Mez; an ALS on a postcard from Russian microbiologist I. L. Kritschewski; a postcard signed by Italian forensic scientist Leone Lattes; as well as several unsigned photos including one of Paul Ehrlich and Louis Pasteur. In fine condition. R&R COA.