TY  - RPRT
TI  - Handbook for CRPL ionospheric predictions based on numerical methods of mapping 
AU  - Ostrow, S M
PY  - 1962
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS HB 90
DO  - 10.6028/NBS.HB.90
ER  -