1930. No edition remarks. 195 pages. No dust jacket. This is an ex-Library book. Brown cloth covered boards with gilt. Black and white diagrams. Book has been rebound by library, with expected inserts, stamps and inscriptions. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Some mild marks and staining to surfaces. Gilt lettering remains bright and clear. Book has slight forward lean.