Einstein Observations of Deep Survey Fields Bechtold, J. ; Forman, W. ; Jones, C. ; Liller, W. ; Marshall, H. ; Murray, S. ; Pye, J. ; Tananbaum, H. ; Giacconi, R. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1979 Bibcode: 1979BAAS...11..460B