title: FORTY YEARS AGO--AND NOW; OPENING ADDRESS DELIVERED AT THE ANNUAL CONGRESS OF THE BRITISH INSTITUTE OF RADIOLOGY, APRIL 22, 1964.
mesh_terms: D006664:History; D049673:History, 20th Century; D006801:Humans; D011871:Radiology
keywords: HISTORY; HISTORY OF MEDICINE, 20TH CENT.; RADIOLOGY