1948. First Edition. 532 pages. Green jacket over green cloth. Fold out chart to front endpaper. 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. Noticeable sunning to boards. The clipped dust jacket has heavy edge wear, with tears, chips and large areas of loss. Moderate tanning to spine and edges.