Exploring federalism, by Daniel J. Elazar. The University of Alabama Press, 1987, 335pp. Price: $28.95 cloth. The regulation of public policy, Donald F. Kettl. Baltimore, MD: The Johns Hopkins University Press, 1983, 201pp. Price: $8.95 paper (New Epilog, 1987). When federalism works, Paul E. Peterson, Barry G. Rabe, and Kenneth K. Wong. Washington, D.C.: The Brookings Institution, 1986, 245pp. NPA cloth and paper. Intergovernmental relations and Public Policy, edited by J. Edward Benton and David R. Morgan. Westport CT: Greenwood Press, 1986, 224pp. Price: $35.00 cloth