X-ray Images of the Crab Nebula Harnden, F. R., Jr. ; Giacconi, R. ; Grindlay, J. ; Hertz, P. ; Schreier, E. ; Seward, F. ; Tananbaum, H. ; van Speybroeck, L. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1980 Bibcode: 1980BAAS...12..799H