Correspondence, memoranda, manuscripts, speeches, documents, and subject files of Willis. Much of the collection deals with the formation and early development of the Federal Reserve System. The papers also deal with his work with the Philippine National Bank, the Irish Banking Commission, the Banking Inquiry of 1925 and the Banking Act of 1933, the New Zealand Monetary Commission, Australian Banking, and the Indian Currency Commission. Among the major correspondents are Charles Francis Adams, Irving Fisher, Carter Glass, Francis W. Hirst, William G. McAdoo, Christopher Morley, Manuel L. Quezon, and E.R.A. Seligman.