Schamroth, Leo. An introduction to electrocardiography / L. Schamroth. - 5th ed. - Oxford : Philadelphia : Blackwell Scientific Publications ; Distributed in the U. S. by Lippincott, 1976. - xii, 240 p. : ill. ISBN: 0632084405 Subjects--Topical Terms: Electrocardiography National Library of Medicine Call No.: WG 140 / Sc17i 1976