title: The proposed international catalogue of incunabula.
mesh_terms: D002381:Catalogs, Library; D005858:Germany; D006666:History of Medicine; D049668:History, 15th Century; D049690:History, Ancient; D049691:History, Medieval; D007187:Incunabula as Topic / Q000266:history*; D007391:International Cooperation; D007993:Libraries, Medical / Q000266:history