PRINCETON UNIVERSITY INTERNATIONAL FINANCE SECTION (Department of Economics) P.O. Box 644 Princeton, New Jersey October 13, 1961 Professor Ludwig von Mises 777 West End Avenue New York 25, N. Y. Dear Professor Mises: I wonder whether I may exchange the enclosed original letter from Froehlich against the carbon copy that I gave you on September 29? The original had been forwarded to Turin and from there to Vienna. It came back to Princeton only this morning. Looking forward to seeing you next Tuesday, I remain, Sincerely yours, Fritz Machlup