Published in "Extragalactic Background Radiation", Space Telescope Science Institute Symposium Series 7, 1995, eds. D. Calzetti, M. Livio and P. Madau

Table of Contents

• INTRODUCTION
• EARLY HISTORY
• ROSAT DEEP SURVEYS DATA
• The log N - log S relation
• The optical identifications
• AGN SPECTRA AND FITS TO THE XRB SPECTRUM
• CONCLUSIONS
• REFERENCES