1939. No edition remarks. 115 pages. No dust jacket. Brown cloth covered boards. Black and white photographs and diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. A previous owner's name to front free endpaper. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Spine edges rubbed. All surfaces tanned and sunned, particularly spine.