Volume 6 translated by W.C. Helmbold; volume 7, by Phillip H. De Lacy and Benedict Einarson; volume 8, by Paul A. Clement and Herbert B. Hoffleit; volume 9, by Edwin L. Minar, F.H. Sandbach, W.C. Helmbold; volume 10, by Harold North Fowler; volume 11, by Lionel Pearson and F.H. Sandbach; volume 12, by Harold Cherniss and William C. Helmbold; volume 13, by Harold Cherniss; volume 15, by F.H. Sandbach.
A made-up set. Volumes 1-13 in multiple reprintings.