Translated by Daniel De Leon & Solon De Leon. New York: New York Labor News Company, 1904-1911. 21 vols. 12mo. Paginated variously. Most volumes exhibit some cover soiling and wear, particularly at extremities, a few have cracked hinges, one has paint spots on front cover. They are basically reading copies but complete sets of this work are seldom encountered. 
This is the entire set of 19 novels in 21 volumes. 17 of the novels were translated by Daniel De Leon, the other two by his son, Solon De Leon. Extra shipping for this multi-volume set.