Columbia subject headings:
Radio astronomy--Congresses.
Radio sources (Astronomy)--Congresses.
Harvard subject headings:
Astronomy
Astrophysics
Galaxies--Congresses
Hot spots (Astronomy)--Congresses.
Nuclear astrophysics--Congresses.
Physical geography.
Physics.
Quantum theory.
Radio sources (Astronomy)--Congresses.
Superluminal radio sources (Astronomy)--Congresses.
Princeton subject headings:
Radio astronomy--Congresses.
Radio sources (Astronomy)--Congresses.