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Doctor Beak (Doctor Schnabel), copper engraving by Paulus Fürst, cca. 1656, from Die Karikatur und Satire in der Medizin: Medico-Kunsthistorische Studie von Professor Dr. Eugen Holländer, 2nd edn (Stuttgart:Ferdinand Enke, 1921), fig. 79 (p. 171)
