Preliminary Hard X-Ray Results from HEAO-1. Wheaton, W. A. ; Hoffman, J. A. ; Primini, F. A. ; Scheepmaker, A. ; Lewin, W. H. G. ; Matteson, J. L. ; Baity, W. A. ; Gruber, D. ; Pelling, M. ; Peterson, L. E. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1977 Bibcode: 1977BAAS....9..610W