Explores the origins of the myth expressed in many early geology textbooks that clay and shale are impervious to water. Misconceptions about the effects of molecular attraction on groundwater appear to have arisen from errant interpretations of correct physicochemical concepts. (PVD)

Maintains that there are several large collections of educational materials that reflect the historical development of textbooks and curriculum guides. Describes major collections at the University of Illinois (Urbana-Champaign), the Center for Research Libraries in Chicago, Harvard University, and Teacher's College, Columbia University. (CFR)