TY  - RPRT
TI  - Mean electron density variations of the quiet ionosphere no. 9 
AU  - Brown, DJ
AU  - Wescott, LR
AU  - Wright, J W
PY  - 1959
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 40-9
DO  - 10.6028/NBS.TN.40-9
ER  -