Columbia subject headings:
Astronomical spectroscopy--Congresses.
Galaxies--Evolution--Congresses.
Stars--Congresses.
Harvard subject headings:
Astronomical spectroscopy--Congresses
Galaxies--Evolution--Congresses
Stars--Congresses
Princeton subject headings:
Astronomical spectroscopy--Congresses.
Galaxies--Evolution--Congresses.
Stars--Congresses.