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