Schamroth, Leo The 12 lead electrocardiogram Book 1 / Leo Schamroth. - Oxford: Blackwell Scientific, 1989. - x, 368 p. : ill. ; 28 cm. ISBN: 0632022035 Subjects--Topical Terms: Electrocardiography. National Library of Medicine Call No.: WG140 / Sch16t 1987