This collection is one of the most important scholarly resources in the West on Czech and Slovak history. Areas of special strength are the World War I period; Czechs and Slovaks at the Paris Peace Conference in 1919; the first Czechoslovak Republic, 1918–39; World War II and German occupation; and post-World War II and socialist Czechoslovakia. It includes important documents on human rights, Charter 77, and other dissident publications. The archival holdings include letters, diaries, manuscripts memoirs reports, speeches, writings, and drafts of works of Czech and Slovak prominent exiles, authors, journalists, diplomats, and other historical and political figures. Included are the papers of Ivo D. Ducháček, Ladislav Karel Feierabend, Vladimír J. Krajina, Radomír Luža, Štefan Osuský, Ferdinand Peroutka, Juraj Slávik, and Edward Táborský. A noteworthy Slovak document is the 1944–45 diary of Stefan Tiso, the premier of Slovakia.
Recent additions include thousands of photocopies of secret documents issued by the Central Committee of the Czechoslovak Communist Party and the Interior Ministry (Jiří Šetina collection); the papers of Jan Čarnogurský, prime minister of Slovakia in 1991–92; and a large collection of the correspondence of Josef Škvorecký, Czech émigré novelist and publisher. Two other recent acquisitions deserve mention. The first, the Hana Konečná papers, includes documentation on prominent World War II-era Czech Communists (Viktor and Otto Synek) and on the philosopher Jan Patočka. The other, the Stanislav Budín papers, includes not only documentation on this prominent communist journalist but also extensive correspondence of his son-in-law, the dissident intellectual Zdeněk Mlynár.