Landauer, T., Egan, D.E., Remde, J.R., Lesk, M.E., Lochbaum, C.C., and Ketchum, R.D., “Enhancing the usability of text through computer delivery and formative evaluation: the Super- Book project” in Empirical Issues in Hypertext, ed. C. McKnight and A. Dillon, 38, pp. 71-136, Univ. Nevada Las Vegas, Washington, DC (1992). Also presented at the Public Record Office, Kew; see their conference on preservation.