Mental retardationDrew, Clifford J, Clifford J. Drew, Michael L. Hardman · First published 1984 · Latest edition 2003Open the Tome
Communication ethics and universal valuesClifford G. Christians, Michael Traber · First published 1997Open the Tome
Human exceptionalityMichael L. Hardman, Clifford J. Drew, M. Winston Egan · First published 1984Open the Tome
Christianity as mystical fact and the mysteries at antiquity. --Rudolf Steiner, Harry Collison, Clifford Venho, David Ecklund, H. Collison, Édouard Schuré, Conscience Arts, Christopher Bamford, Andrew Welburn, Michael Debus · First published 1902Open the Tome