TY  - RPRT
TI  - Basic radio propagation predictions for April 1956: three months in advance
PY  - 1956
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS BRPD-CRPL-D 137
DO  - 10.6028/NBS.BRPD-CRPL-D.137
ER  -