This collection contains papers documenting the activities of Joseph Roos (1905-1999) from his retirement from the Community Relations Committee of the Jewish Federation Council in 1969 until his death in 1999. These papers include correspondence, research files, memoranda and publications. Some documentation of Roos's earlier activities investigating the activities of the German Bund in Los Angeles in the 1930s is also present.

The collection comprises materials related to von Hofe's tenure as a librarian at USC as well as manuscripts, research notes, articles, and correspondence. Most materials are related to Lion and Marta Feuchtwanger as well as other German-speaking exiles.