TY  - BOOK
AU  - Bergmann, Ludwig.
AU  - Hatfield, H. Stafford.
TI  - Ultrasonics
U1  - 534.55 
PY  - 1938///
CY  - London
PB  - G Bell and Sons
KW  - Ultrasonics
KW  - Ultrasonic technology
KW  - Acoustic engineering
N1  - Includes bibliographic references and index
ER  -