Hard X-rays and Limits on Gamma Line Emission from a Solar Flare on 22 November 1971 Guo, D. D. ; Damle, S. V. ; Kish, J. C. ; Lezniak, J. ; Webber, W. R. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1972 Bibcode: 1972BAAS....4..383G