00818nam0-22003011i-450-990001119830403321000111983FED01000111983(Aleph)000111983FED0100011198320000920d1969----km-y0itay50------baengPhysical UltrasonicsRobert T. Beyer and Stephen V. LetcherNew YorkAcademic Press1969Pure and applied physics15SuonoAcustica534Beyer,Robert Thomas<1920- >44873Letcher,Stephen V.ITUNINARICAUNIMARCBK99000111983040332126-04619784FI1FI1Physical Ultrasonics336838UNINAING01