TY  - BOOK
AU  - Chapman, S.R. 
AU  - Smith-Rose , R.L. 
TI  - An investigation of a rotating radio beacon
U1  - 621.384191 21st ed.
PY  - 1928///
CY  - London
PB  - His Majestys Stationery Office
KW  - Radio beacons
ER  -