1968. 7th Edition.. 386 pages. Green pictorial dust jacket over green cloth. Pages are lightly tanned and thumbed at the edges, with light foxing. Binding has remained firm. Boards are a little rub worn, slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are mildly crushed. Light tanning to spine and edges. Slight forward lean to text block. Light wear to unclipped dust jacket with tears, nicks and creases to spine, edge and corners. Light tanning to spine and edges.