Second edition. 139 pages. No dust jacket. Pictorial cloth covered boards. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Some cracking to hinges and gutters. Binding slightly loose. Minor pen and pencil inscriptions to front. Boards have heavy shelf wear with bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Gilt lettering to spine is dulled but remains brighter on front.