Book Review Williams Hematology Fifth edition. Edited by Ernest Beutler, Marshall A. Lichtman, Barry S. Coller, and Thomas J. Kipps. 1668 pp., illustrated. New York, McGraw-Hill, 1995. $135. 0-07-070386-8 Hematology: Basic Principles and Practice Second edition. Edited by Ronald Hoffman, Edward J. Benz, Jr., Sanford J. Shattil, Bruce Furie, Harvey J. Cohen, and Leslie E. Silberstein. 2369 pp., illustrated. New York, Churchill Livingstone, 1995. $169.95. 0-443-08914-0 Current Therapy in Hematology-Oncology (Current Therapy Series.) Fifth edition. Edited by Michael C. Brain and Paul P. Carbone, with John G. Kelton and Joan H. Schiller. 647 pp. St. Louis, Mosby, 1995. $79.95. 0-8151-1189-4 Haemostasis and Thrombosis Third edition. Edited by Ar