1971. No Edition Remarks. 489 pages. No dust jacket. Blue cloth boards with gilt lettering. Contains black and white illustrations and folded diagrams. Clean pages and illustrations with light tanning and mild foxing throughout. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Minor splits to spine ends and corners causing cloth to be frayed. Visible wear marks to boards.