1970. Sixth revised and enlarged editi. 159 pages. Pictorial paper covered boards with cloth spine. Black and white illustrations throughout and colour illustration plates. Ex libris plate at front. Pages remain bright and clean with minimal tanning and foxing. Binding slightly loose. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Boards are slightly bowed.