HB book, "10th Annual Report of the National Advisory Committee for Aeronautics, 1924, including technical reports nos. 186 to 209", by U.S. Government Printing Office, 499 pages with some b/w photos/illustrations.  Book is in decent shape, some cover wear and fading/discoloration/soiling, binding is cracking at the front and partially at the back, some yellowing, clean pages.  An interesting, unique book!