Suggestions for Further Reading 



Morris, M.; and Rikard, L. J.: Molecular Clouds in Galaxies. Ann. Rev. 

 Astron. Astrophys., vol. 20, 1982, p. 517. 



Stein, W. A.; and Soifer, B. T.: Dust in Galaxies. Ann. Rev. Astron. 

 Astrophys., vol. 21, 1983, p. 177. 



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