3 Volume set of medical books, translated to English meaning Clinic of Malignant Tumors by Paul Zweifel and Erwin Payr. Dated 1924. Blue covers with gold text.  10" tall by 7" wide. They contain color images and diagrams. Good condition overall with moderate soiling to the hardcovers, pages are good and clean. Signed inside cover by the doctor who owned these, Anthony Ries, MD.