Preliminary X-ray Map of the Cygnus Loop by ANS Gronenschild, E. H. B. M. ; Mewe, R. ; Heise, J. ; Brinkman, A. C. ; den Boggende, A. J. F. ; Schryver, J. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1976 Bibcode: 1976BAAS....8Q.449G