Columbia subject headings:
International Peace Conference (1st : 1899 : Hague, Netherlands)--History.
International law--Congresses--History--19th century.
International law--Congresses.
Peace--Congresses--History--19th century.
Peace--Congresses.
Harvard subject headings:
Princeton subject headings:
International Peace Conference (1st : 1899 : Hague, Netherlands)
International law--Congresses.
Peace--Congresses.