1968. Fifth printing. 200 pages. No dust jacket. This is an ex-Library book. Pictorial paper covered boards. Black and white diagrams throughout. Book has been rebound by library, with expected inserts, stamps and inscriptions. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have mild shelf wear with light rubbing and corner bumping. Some light marking and sunning. Boards are slightly bowed.