Krek's correspondence, manuscripts, subject files, and printed materials concern the London Yugoslav government-in-exile during World War II. There are one or two letters each in the collection from Louis Adamic, Edvard Beneš, and Anthony Eden. There are files of correspondence and related materials from or to such Yugoslav leaders as Slobodan Jovanoviʹc, Dušan Simoviʹc, and Franc Snoj, and also several files on events in Slovenia during the war.