The Norbert Muehlen collection consists of manuscripts, correspondence, printed material, and other material.
Manuscripts in the collection include various book-length works, short pieces, dispatches, book reviews, interviews, miscellaneous drafts, notebooks, and cards.
Correspondence in the collection is extensive, including both personal and professional letters. They date from 1940 to 1981.
Printed material in the collection includes material by Muehlen; items about Muehlen, including book reviews; general research; and international Telex reports of articles by Muehlen.
Other material in the collection includes photographs; drawings; daily engagement books and an address book, dating from 1949 and 1957-1981; and two files of documents regarding Kurt Baer, about his emigration from France, his U.S. citizenship, restitution applications, and his parents, dating from 1929 to 1957.