Molecular cloning: A laboratory manual. Second edition. Volumes 1, 2, and 3. Current protocols in molecular biology. Volumes 1 and 2: By J. Sambrook, E. F. Fritsch, and T. Maniatis. Cold Spring Harbor, New York: Cold Spring Harbor Laboratory Press. (1989). 1626 pp. $115.00. Edited by F. M. Ausubel, R. Brent, R. E. Kingston, D. D. Moore, J. G. Seidman, J. A. Smith, and K. Struhl. New York: Greene Publishing Associates and John Wiley & Sons. (1989). 1120 pp. $255.00