1931. Reprinted. 152 pages. No dust jacket. Brown cloth covered boards with gilt. Black and white photographs and diagrams. Pages with some foxing and tanning, particularly to endpapers and textblock edges. 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. All surfaces heavily tanned. Gilt lettering to spine is slightly dulled. Boards are slightly bowed.