1918. Fourth Edition. 161 pages. No dust jacket. Green cloth. Contains colour illustrated frontispiece, with black and white illustrated plates throughout. Graph and map to rear of textblock. Pages and plates remain bright and clear. Mild foxing to endpapers. Binding is firm. Inscriptions and visible marks to front endpapers. Boards have light shelf-wear, with minor corner bumping and minimal scuffing to edges. Spine is slightly sunned, with noticeable crushing and slight splitting to ends. Visible marks overall. Book has a minor backwards lean.