1966. Second printing. 420 pages. Pictorial dust jacket over red cloth. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Minor pen inscriptions and tape marks to endpapers. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Unclipped jacket has light edge wear with minor tears, chipping and creasing. Spine noticeably sunned.