The Czech and Slovak Republics: Nation versus State. By Carol Skalnik Leff. Boulder, CO: Westview, 1997. 295p. 69.95cloth,22.95 paper. - Czecho/Slovakia: Ethnic Conflict, Constitutional Fissure, Negotiated Breakup. By Eric Stein. Ann Arbor: University of Michigan Press, 1997. 386p. $57.50.