Wells, P. N. T. Physical principles of ultrasonic diagnosis [by] P. N. T. Wells. - London, New York, Academic Press, 1969. - viii, 282 p. illus. 24 cm. - Medical physics series, v. 1 . ISBN: 0127429506 LCCN: 76092398 Nat. Bib. No.: B*** Subjects--Topical Terms: Diagnostic ultrasonic imaging. LC Class. No.: RC78.7.U4 / W45 Dewey Class. No.: 616.075 43 WEL