1950. First Edition. 108 pages. No dust jacket. This is an ex-Library book. Red cloth covered boards. Black and white diagrams throughout. Ex library copy with associated labels, inserts, stamps and annotations. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Some marks and staining to surfaces.