1927. Reprinted. 601 pages. No dust jacket. Black cloth covered boards. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Heavy marking to endpapers. Boards have heavy shelf wear with bumping and fraying to corners and crushing and fraying to spine ends. Some marks and staining to surfaces. Gilt lettering is dulled. Boards are slightly bowed.