IG Bulletins: No. 76, No. 77, No. 78

This is one of a series of reports prepared periodically during and since the IGY/IGC period. It is based on summaries issued by the World Warning Agency (AGIWARN), National Bureau of Standards, Fort Belvoir, Virginia, and on compilations of Solar‐Geophysical Data issued by the Central Radio Propagation Laboratories (CRPL), NBS, Boulder, Colorado. The former are prepared under the direction of Kent D. Boggs, Head, AGIWARN, and the latter under the direction of J. Virginia Lincoln, Chief, Radio Warning Services Section, NBS. Various earlier Bulletins have carried past reports on solar‐geophysical activity and AGIWARN decisions; reports covering the first and second halves of 1961 appear in Bulletin Nos. 52 and 57, respectively.