1957. No edition remarks. Unpaginated. No dust jacket. This is an ex-Library book. Blue cloth covered boards with gilt. Black and white diagrams throughout, some in pocket at rear. Book has been rebound by library, with expected inserts, stamps and inscriptions. Pages remain bright and clean with minimal tanning and foxing. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Gilt lettering to spine is slightly dulled. Some mild marks and staining to surfaces.