Columbia subject headings:
Berne Convention for the Protection of Literary and Artistic Works--Revisions, 1928.
Berne Convention for the Protection of Literary and Artistic Works--Revisions, 1948.
Copyright, International.
Harvard subject headings:
Bern copyright convention (1886)--Revisions, 1928.
Bern copyright convention (1886)--Revisions, 1948.
Princeton subject headings: