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Article Contents

TITLE PAGE

1.GAS IN GALAXIES

2.ATOMIC AND MOLECULAR CLOUDS

3.THE INTERCLOUD MEDIUM

4.THE SOLAR NEIGHBORHOOD

5.THEORIES OF THE ISM

5.1.The Two-Phase Model

5.2.The Three-Phase Model

6.THE INFLUENCE OF SUPERNOVA

7.THE ROLE OF PULSARS

8.THE INFLUENCE OF MAGNETIC FIELDS

9.DEPENDENCE ON GALAXY TYPE

10.UNANSWERED QUESTIONS

BIBLIOGRAPHY