1951. First Edition. 915 pages. Green cloth with gilt lettering to spine. Black and white diagrams and tables illustrated throughout. Binding remains firm. Pages remain bright and clear with light tanning to edges. Pastedowns and text block edges are lightly tanned. Small water marks to top edge of text block. Text is not affected. Boards have light shelf-wear with corner bumping. Light sunning to spine and edges. Slight crushing to spine ends. Gilt lettering is bright and clear. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Light tanning to all surfaces. Small area of loss to edges.