The Statesman's Year-Book. St. Martin's Press, annual. A statistical and historical annual of the states of the world, Berks has volumes from 1960 - to date, with the latest one kept in Reference. The Europa World Year Book. Ref JN1.E8501 Contains recent history, economic, political, statistical, and other information about countries and international organizations.
Berks has the latest edition.
Ziring, Lawrence, Jack C. Plano, and Roy Olton. A Political Dictionary, 5th ed. The Major International Treaties, 1914-1945, A History and Guide with Texts. Since 1945, A History and Guide with Texts. Together these books provide texts of treaties with commentary for 1914 - 1986.