1981. No Edition Remarks. 390 pages. No dust jacket. Brown cloth boards with lettering. Contains black and white illustrations. Volume 16 Minerals and Rocks. Clean pages and illustrations with light tanning and mild foxing throughout. Pen inscription to front free endpaper. 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.