 The RIAS has an extensive library collection on American and transatlantic history, including both secondary and primary sources.While the extensive book collection, with more than 9500 entries, can be searched by use of an online catalogue, the institute also owns more than a hundred microfilm collections and digital resources.These include, among others, copies of the papers of President Theodore Roosevelt; the presidential Office Files of Franklin D. Roosevelt, Harry S. Truman, Dwight D. Eisenhower, and John F. Kennedy; the papers of W.E.B.