Columbia subject headings:
Cosmochemistry--Congresses.
Cosmology--Congresses.
Helium--Congresses.
Nucleosynthesis--Congresses.
Harvard subject headings:
Cosmochemistry--Congresses.
Cosmology--Congresses.
Helium--Congresses.
Nebular hypothesis--Congresses.
Nucleosynthesis--Congresses.
Princeton subject headings:
Cosmochemistry--Congresses.
Helium--Congresses.
Nuclear astrophysics--Congresses.