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Article Contents

ABSTRACT

1.INTRODUCTION
1.1.Basics of Quasar Spectra

2.HISTORY, SURVEYS, AND REVOLUTIONARY PROGRESS IN THE 1990's

3.DEVELOPING PHYSICAL INTUITION
3.1.Kinematic Models
3.2.Photoionization Models

4.MULTIPHASE CONDITIONS

5.STATISTICS, EVOLUTION, AND INTERPRETATION
5.1.Ly alpha Forest
5.2.Lyman Limit and Metal Line Systems
5.3.Damped Ly alpha Systems

6.FUTURE PROSPECTS

BIBLIOGRAPHY