Columbia subject headings:
International Peace Conference (1st : 1899 : Hague, Netherlands)
International Peace Conference (2nd : 1907 : Hague, Netherlands)
Prisoners of war.
Harvard subject headings:
International Peace Conference (1st : 1899 : Hague, Netherlands)
International Peace Conference (2nd : 1907 : Hague, Netherlands)
Prisoners of war
Princeton subject headings: