830 PARK AVENUE NEW YORK 21. NEW YORK March 1, 1949 Dear Dr. von Mises, May I ask a great favor of you. A collection of my articles, written over the last few years, will appear shortly under the title "The Economics of Illusion". Could you take a look at the unbound advance copy which I send herewith, and perhaps let me have some comments for use in publicizing the book ? The trouble I am causing you may not be as great as would seem at first sight, for I have been sending you copies of my articles as they appeared. Only the introductory remarks, chapter 14, chapter 15, one or two others and the concluding remarks, will be new to you. Publication date is set for April 1st and if you are able to fulfill this request I would be most grateful to hear from you as early as possible. As soon as bound copies are ready I will be happy to send one to you. With all good wishes. Yours sincerely, selling L.Albert Hahn Dr. Ludwig von Mises, 777 West End Avenue, New York, N.Y.