Procedures and recommendations for the ultrasonic testing of butt welds / Welding Institute. - 2nd ed. - Abington Hall : Welding Institute, 1971. - [4], 42 p. : ill ; 30 cm. + sd. Previous ed. 1965. ISBN: 0853000565 Subjects--Topical Terms: Welded joints--Testing. Dewey Class. No.: 671.52