Dimensions Abbott, Edwin A. Flatland: A Romance of Many Dimensions, by A. Square. New York: Dover, 1992. 83 p. $1. Crowell, Thomas Y. Sphereland: A Fantasy about Curved Spaces and an Expanding Universe. 1965. $?. Dewdney, A.K. The Planiverse: Computer Contact with a Two-Dimensional World. New York: Poseidon Press, 1984. 267 p. $?. Gardner, M. ``The Wonders of a Planiverse.'' Ch. 1 in The Last Recreations: Hydras, Eggs, and Other Mathematical Mystifications. New York: Springer-Verlag, pp. 1-25, 1997. $25. Hinton, Charles Howard. An Episode of Flatland. Swan Sonnenschein, 1907. Hinton, Charles Howard. The Fourth Dimension. Pomeroy, WA: Health Research, 1993. 247 p. $14. Manning, Henry Parker. The Fourth Dimension Simply Explained. Magnolia, MA: Peter Smith, 1990. $14.50. Manning, Henry Parker. Geometry of Four Dimensions. New York: Dover, 1956. 348 p. Nevillle, E.H. The Fourth Dimension. Cambridge, England: Cambridge University Press, 1921. Pickover, Clifford A. Surfing through Hyperspace: Understanding Higher Universes in Six Easy Lessons. Oxford, England: Oxford University Press, 1999. 256 p. $17.50. Rucker, Rudy von Bitter. The Fourth Dimension: A Guided Tour of the Higher Universes. Boston, MA: Houghton Mifflin, 1984. 228 p. $8.95. Sommerville, D.M.Y. An Introduction to the Geometry of n Dimensions. London: Meuthen, 1929. Out of print.