1957. 146 pages. No dust jacket. This is an ex-Library book. Blue cloth boards with gilt lettering. Ex-library copy with expected inserts, stamps and inscriptions. Contains hand drawn diagrams by the Author. Pages printed on one side only. Pages are clean and bright with a firm binding. End papers and pages edges are lightly tanned and foxed. A couple of lines of text at the bottom of the acknowledgements page have been blacked out. Extensive tape, stamps and pen inscriptions to front pastedown and endpaper. Sticker marks and tears to both pastedowns. Includes a few errata labels. Boards are a little rub worn with some slight shelf wear to corners, spine and edges. Corners are a little bumped and spine ends are a little crushed, with some small splits and chips. With some tanning to spine and edges. Library call card taoed to spine and front board.