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Article Contents

TITLE PAGE

1.INTRODUCTION

2.GALAXIES WITH ABUNDANT MOLECULAR GAS
2.1.OH Absorption Surveys
2.2.CO Emission Surveys

3.THE DISTRIBUTION OF MOLECULAR MATERIAL WITHIN GALAXIES
3.1.Maps of Carbon Monoxide Emission
3.2.A Classification Scheme

4.MOLECULAR CLOUDS IN THE CENTRAL REGIONS OF GALAXIES
4.1.Is There a Distinct Central Concentration of Molecular Clouds?
4.2.Optically Thin CO
4.3.OH Absorption-Line Anomalies
4.4.Correlations of Molecular Sources with Nuclear Activity
4.5.Seyfert Galaxies

5.MOLECULAR CLOUDS IN GALACTIC DISKS
5.1.Spiral Arms, Bars, and Giant Complexes
5.2.Interrelations of Far-Infrared, Nonthermal Continuum, and CO Emission
5.3.Implications for Star Formation
5.4.NGC 5128 - A Special Case

6.EXTRAGALACTIC CHEMISTRY

7.EXTRAGALACTIC MASERS

8.PERSPECTIVES

REFERENCES