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by Angel, Robert
by Benson, Robert Hugh; Sanchez, Angel
by Stevenson, Robert Louis; Sanchez, Angel
by Robert W. Heath Jr. , Angel Lozano
by Telle, Helmut H.; Ureñ; a, Angel Gonzá; et al.
by Petty, Angel Bishop; Engel, Robert
by Schalock, Robert L., Ph.D.; Alonso, Miguel Angel Verdugo, Ph.D.; Gettings, Robert M.
by Helmut H. Telle (University of Wales, Swansea, Wales); Angel Gonzá; lez Ureñ; et al.