1940. Second Edition. 314 pages. No dust jacket. Green cloth boards with gilt lettering. Contains black and white illustrations and folded diagrams. Clean pages and illustrations with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Moderate water staining to bottom edges textblock. Pen annotations and marginalia to a few pages. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is darkened. Book has a slight forward lean. Visible wear marks to boards.