Chang, Sonia Echocardiography, techniques and interpretation / Sonia Chang, with the assistance of John K. Chang - 2nd ed. - Philadelphia : Lea & Febiger, 1981 - xii, 362 p. : ill. ; 26 cm. ISBN: 0812107845 Subjects--Topical Terms: Ultrasonic cardiographyEchocardiography National Library of Medicine Call No.: WG141.5.E2 / C456m 1981 9