Extragalactic Results from the Scanning Modulation Collimator on HEAO-1 (invited) Schwartz, D. A. ; Bradt, H. V. ; Briel, U. ; Doxsey, R. E. ; Fabbiano, G. ; Griffiths, R. E. ; Johnston, M. D. ; Schwarz, J. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1978 Bibcode: 1978BAAS...10..499S