1952. First Edition. 384 pages. No dust jacket. Green cloth covered boards with gilt lettering. Black and white diagrams and photographic plates throughout and similar photographic frontispiece. Green top to textblock. Pages bright and clean with some tanning and foxing, particularly to textblock edges and endpapers. Frontispiece slightly detaching. Binding remains firm. Boards have minimal shelf wear with only mild bumping to corners, but some tanning. Spine with mild crushing. Gilt lettering is slightly dulled.