IGY Solar Activity Report Series, No. 21: McMath-Hulbert Observatory Working List of Flares and Daily Flare Index for 1961 | ARC Archives Catalog
IGY Solar Activity Report Series, No. 21: McMath-Hulbert Observatory Working List of Flares and Daily Flare Index for 1961
Dodson, Helen Walter, and Emma Ruth Hedeman. 1961. McMath-Hulbert Observatory working list of flares and daily flare index for IGY-1959. Boulder, Col: High Altitude Observatory, Univ. of Colorado.
ARC Archives Catalog
National Academy of Sciences - National Research Council