Columbia subject headings:
Harvard subject headings:
Cosmology--Congresses.
Grand unified theories (Nuclear physics)--Congresses
Magnetic monopoles--Congresses.
Protons--Decay--Congresses.
Quantum gravity--Congresses.
Princeton subject headings:
Cosmology--Congresses.
Grand unified theories (Nuclear physics)--Congresses.
Magnetic monopoles--Congresses.
Protons--Decay--Congresses.
Quantum gravity--Congresses.