As new hardcovers in dust jackets. Dover: reprint (1990) of Volumes I-IV bound in two volumes. 178 plates, including 90 in full color, and 20 maps. Volume I - 198 pp.; Volume II - 269 pp.; Volume III - 204 pp.; Volume IV - 242 pp. The rare original edition (published 1918-1922) in four volumes is also available from Buteo Books.