Volume 23C of this research annual first presents lecture notes from courses at the University of Wisconsin during 1955-6 given by Hans Hl. Gerth and Edwin E. Witte, together with correspondence of Selig Perlman. The volume also presents notes taken by F. Taylor Ostrander in courses given at the University of Chicago during 1933-4. The notes are from courses given by John U. Nef, Charles O. Hardy, and Chester W. Wright, on European economic history, money and banking, and U.S. economic history, respectively.