title: Stamps in cardiology. Phonocardiography.
authors: M K
authors: MK
authors: Davies
authors: A
authors: A
authors: Hollman
mesh_terms: D002031:Bulgaria; D006337:Heart Murmurs / Q000266:history; D049673:History, 20th Century; D006801:Humans; D010678:Philately; D010701:Phonocardiography / Q000266:history*