1920. No Edition Remarks. 202 pages. No dust jacket. Blue cloth. With fold-out charts and diagrams. Pages are lightly tanned and foxed throughout. Mild creasing to fold-out charts, with some small tears to edges. Binding remains firm. Boards have moderate edge wear with bumping to corners and rubbing to surfaces. Crushing to spine ends with small splits and fraying to cloth. Mild tanning to spine and edges. Rubbed marking overall.