X-Ray Observations of the Crab Nebula with the Einstein Observatory. Harnden, F. R., Jr. ; Buehler, B. ; 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 1979 Bibcode: 1979BAAS...11..789H