Cambridge.University Press. 1955. 1957. 1962. xxvii, [3], 216pp. 2 plates. xix, [3], 404pp. 1 plate. xv, [1], [2], 3 - 665pp. 2 plates. original green cloth with black, gilt labels. Dust-wrappers. Octavos. First editions. Fine copies of the first three volumes - lacking the fourth and final volume of correspondence.