Tenth Printing. 149 pages. Paperback book with pictorial cover. Part of Foundations on Earth Science Series. Black and white illustrations throughout. Pages remain bright with mild foxing to end pages. Light staining to text block edges. Binding remains firm. Previous owner's inscription to half title page. Covers have moderate shelf-wear with bumping to edges and dark rubbing to surfaces. Small scuffs to rear cover. Previous owner sticker to front.