Columbia subject headings:
Galaxies--Congresses.
Galaxies--Evolution--Congresses.
Harvard subject headings:
Astronomy
Astrophysics
Cox, Donald P.
Galaxies--Congresses
Galaxies--Evolution--Congresses
Milky Way--Congresses.
Physics
Reynolds, Ronald Jay, 1943-
Princeton subject headings:
Galactic dynamics.
Galactic halos.
Galaxies.
Magnetic fields.
Milky Way.