Columbia subject headings:
International Telegraph Convention, 1865--Revisions (1875 Regulations) 1928.
Telegraph (International law)--Congresses.
Telegraph and telephone--Law and legislation.
Harvard subject headings:
International telegraph convention, 1865--Revisions (1875 Regulations) 1928.
Telegraph (International law)--Congresses.
Telegraph--Law and legislation
Telephone--Law and legislation
Princeton subject headings: