1923. No Edition Remarks. No dust jacket. Grey paper covered boards with black cloth spine and lettering. Contains black and white illustrations. Contains black and white illustrations and folded diagrams. Part I. Clean pages and illustrations with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Pencil markings to pastedowns. Hinges are moderately cracked with exposed netting. Binding remains firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Lettering is darkened. Moderate scuffing and loss to spine, edges and corners. Visible wear marks to boards.