1970. 921 pages. No dust jacket. This is an ex-Library book. Green cloth. Book has been rebound by library, with expected inserts, stamps and inscriptions. Volume 120. Contains black and white graphs and photographic plates. Pages are mostly clean overall, with mild tanning throughout. Binding remains firm. Plates are bright and clear, with some light tanning and foxing to edges. Boards have slight edge wear with corner bumping. Mild tanning to spine and edges with some crushing to spine ends. Gilt lettering is bright and clear. Book has a slight forward lean.