00750nam0-22002891i-450-990000021800403321000002180FED01000002180(Aleph)000002180FED0100000218020011111d--------km-y0itay50------baitay-------001yyUltrasonic physicsE. G. Richardson.AmsterdamElsevier publishing company1952X, 285 p.ill.23 cmUltrasuoniAcustica534Richardson,Edward GickITUNINARICAUNIMARCBK99000002180040332113 B 33 0919782FINBCFINBCUNINAING01