1950. 4th edition. 388 pages. No dust jacket. Blue cloth. Contains black and white illustrations. Moderate tanning, with light foxing and marking to pages. Heavy tanning to text block edges. Some rub-marking and tanning to pastedowns and endpapers with plate to front. Boards have moderate shelf wear, with rubbing and marking. Light bumping to corners and crushing to spine ends. Binding remains firm with water marks and sunning overall.