Four-Color Problem see also Four-Color Theorem Barnette, David. Map Coloring, Polyhedra, and the Four-Color Problem. Washington, DC: Math. Assoc. Amer., 1983. 168 p. $12. Franklin, Philip. The Four Color Problem. New York: Scripta Mathematica, Yeshiva College, 1941. 85 p. Ore, Øystein. The Four-Color Problem. New York: Academic Press, 1967. 259 p. $?. Saaty, Thomas L. and Kainen, Paul C. The Four-Color Problem: Assaults and Conquest. New York: Dover, 1986. 217 p. Excellent and very readable introduction to graph theory. $7.95.