The Nature of Law Today - Hard Cases in Wicked Legal Systems: South African Law in the Perspective of Legal Philosophy. By David Dyzenhaus. New York: Oxford University Press, 1991. 289p. $69.00. - Natural Law Theory: Contemporary Essays. Edited by Robert P. George. New York: Oxford University Press, 1992. 371p. $39.95. - Law and Objectivity. By Kent Greenawalt. New York: Oxford University Press, 1992. 288p. $45.00. - Playing by the Rules: A Philosophical Examination of Rule-Based Decision-Making in Law and Life. By Frederick Schauer. New York: Oxford University Press, 1991. 254p. $39.95. - Norm and Nature: The Movements of Legal Thought. By Roger Shiner. New York: Oxford University Press, 1992. 348p. $49.95.