Published by the Autogiro Company of America, Philadelphia. Issues are: Sep 1931, Oct 1931, Dec 1931, Feb 1932, May 1932. Each issue is 8.5x11", the first four are 4 pages plus a 4 page supplement; the May 1932 issue is 8 pages. Condition very good; center horizontal fold for mailing. Unusual and scarce publication.