Ay 124:  The Global Distribution and Properties of Gas in the Galaxy
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GKK chapter 4; MB chapter 9;  Ay 126...

Possibly the best, comprehensive modern reviews are the chapters
by Burton (**), by Kulkarni & Heiles, and to some extent by Turner,
in "Galactic and Extragalactic Radio Astronomy", eds. Verschuur
and Kellermann, Springer-Verlag (1988).

Some other modern reviews:

    Dickey, J., and Lockman, F. 1990, A.R.A.A. 28, 215.

    Knapp, G. 1987, P.A.S.P. 99, 1134.

    Blitz, L., Fich, M., and Kulkarni, S. 1983, Science 220, 1233.


Many other relevant reviews can be found in the following conference 
proceedings:

    "The Galaxy", eds. G. Gilmore, and R. Carswell.  NATO ASI Ser., 
       vol. 207.  Dordrecht: Reidel (1987).

    "The Milky Way Galaxy", IAU Symposium 106, eds. van Woerden et al.
       Dordrecht: Reidel (1985).

    "Kinematics, Dynamics, and Structure of the Milky Way", 
       ed. W. Shuter.  Dordrecht: Reidel (1983).

    "The Large-Scale Structure of the Galaxy", ed. W. Burton.  
       Dordrecht: D. Reidel (1979).