Title: The Structure and Dynamics of the Milky Way Galaxy Author: Leo Blitz (University of Maryland) Source: Annual Review of Astronomy and Astrophysics , Vol. 31, 1993
https://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1993ARA%26A..31..313B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf galactic astronomy pdf