1. Electromechanical transducers and wave Filters;Mason,1948
2. Piezoelectric crystals and their application to ultrasonics;Mason,1950
3. Summarised proceedings of symposium on applications of ultrasonics;Bradfield;Proceedings of Physical Society B,1950
4. Frequencies for air sonar;Bradfield;Ultrasonics,1966
5. Practical applications and measurements on ferrite electro-mechanical transducers;Bradfield;Proceedings of the IEE,1957