1973. Fourth Edition. 139 pages. No dust jacket. Blue cloth boards with gilt lettering. Contains black and white and colour illustrations, plates and folded charts. Clean pages, illustrations and plates with light tanning and mild foxing throughout. Minor tape marks to pastedowns. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Minor wear marks to boards.