Bartrum, Royal J Crow, Hartee C Gray-Scale Ultrasound A Manual for PhysiciaNS AND Technical Personnel - Philadelphia:W.B. Saunders 1977 - 1-213pgs - Ultrasound ISBN: 0-7216-1548-1 Nat. Bib. No.: 001005 Dewey Class. No.: 616-073.43B16