Columbia subject headings:
Harvard subject headings:
Cosmochronology--Congresses.
Cosmology--Congresses.
Nuclear astrophysics--Congresses.
Nuclear astrophysics--Technique--Congresses.
Stars--Age--Congresses
Stars--Age--Measurement--Congresses
Princeton subject headings:
Astrophysics--Congresses.
Stars--Age--Congresses.