RT Journal Article SR Electronic T1 An Elementary Atlas of Cardiography An Introduction to Electrocardiography and X-Ray Examination of the Heart JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 45 OP 45 DO 10.1136/pgmj.25.279.45 VO 25 IS 279 YR 1949 UL http://pmj.bmj.com/content/25/279/45.abstract AB