TY  - BOOK
AU  - Inter-service ionosphere bureau
AU  - Dept. of Scientific and Industrial research and admiralty
TI  - Fundamental principles of inospheric transmission
T2  - Dept.of Scientific and industrial research and admiralty
U1  - 621. 
PY  - 1948///
CY  - London
PB  - Her majesty's stationary office
ER  -