Scope and Contents Most of the material in the Thomas Collection was created during his senatorial years. Because Thomas served over half of his years in the Senate during the Great Depression and World War II, the collection is an excellent source on the history of the nation and Oklahoma during the 1930s and 1940s. The files reflect the national debate over these two major crises and include opinions of colleagues, figures in the Franklin D. Roosevelt administration, and other prominent personalities. Because...