TY  - BOOK
ED  - Department of Scientific and Industrial Research. 
TI  - Report of the radio research board or the period ended 31 st december 1930/ 
U1  - 384.5 
PY  - 1931///.
CY  - London : 
PB  - Majesty's Stationery Office, 
KW  - Radio research .
N1  - Includes bibliographical references .
ER  -