TY  - BOOK
AU  - Beynon, W. J. G., ed.  Minnis, C. M., ed. 
TI  - Annals of the International Geophysical Year: v. IV : tables of IGY monthly median ionospheric data
T2  - Annals of the International Geophysical Year
SN  - 1483226328
PY  - 1961///
CY  - Oxford
PB  - Pergamon Press
KW  - International Geophysical Year
ER  -