Volume 4 lacks edition statement. Gradually being replaced by 4th edition, 2003-. Supplements published: Aspen Publishers (1998- ). Volume 4 by Martin A. Schwartz and George C. Pratt issued in loose-leaf format, 2000-. Includes index.
Supplement Note
Vols. 1-3 kept up to date by pocket parts and supplements; vol. 4 kept up to date by CD-ROM supplements.