1950. Second Edition (Revised). 132 pages. No dust jacket. Blue cloth covered boards. Fold outs. Pages remain clear with minimal tanning and foxing, heavier at end papers. Cracking to gutters, no damage to end papers. Binding remains firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Mild crushing to spine ends, with fraying cloth. Mild ring mark to Cloth has minor damp and dust stains.