1937. Sixth edition. 112 pages. No dust jacket. Signed by the author. Pictorial cloth covered boards. Black and white photographs. Flat signed by author to front free endpaper. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Some mild marks and staining to surfaces. Text on spine heavily dulled. Boards are slightly bowed.