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by Dominguez, Deborah; Engel, Richard; Vidal, Sierra Mon Ann
by Wallace, Richard C., Jr.; Engel, David E.; Mooney, James E.
by Immerman, Richard H.; Engel, Jeffrey A.
by Richard Engel
by Engel, Richard
by Engel, Vincent; Kutner, Richard
by Nance, Malcolm; Engel, Richard
by Iorio, Dominick A.; Libowitz, Richard L.; Littell, Marcia S.; et al.