1908-1969 Twentysix volumes. 178, 114, 112, 340, 288, 179, 401, 233, 163, 320, 380, 293, 278, 253, 274, 251, 499, 196, 248, 244, 524, 228, 179, 451, 353, 128 p., many hundreds of figures, green half cloth, title in gilt on spine, original printed covers bound in (volumes I-XIX), green publisher’s cloth/hardbound (volumes XX-XXVI). Library stamps and markings, else a good clean, tightly bound set. This set took almost 60 year to produce, and such sets are rare to say the least.