AN EVENING ON THE EAR (GEORGE MORRISON COATES).
D006310:Hearing Aids; D049672:History, 19th Century; D049673:History, 20th Century; D008511:Medicine; D010036:Otolaryngology; D010414:Pennsylvania
BIOGRAPHIES; HEARING AIDS; HISTORY; HISTORY OF MEDICINE, 20TH CENT.; OTORHINOLARYNGOLOGY; PENNSYLVANIA