TY  - RPRT
TI  - Comparison of geomagnetic records and North Atlantic radio propagation quality figures - October 1943 through May 1945 
PY  - 1945
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IRPL 18
DO  - 10.6028/NBS.IRPL.18
ER  -