20010326d1970 y0pory50 bacreatorCOHENJulius S340Committee on Mental RetardationInstitute for the study of Mental RetardationNational Institute of Child Health and Human DevelopmentCanadian Association for the Mentally RetardedBANFF International ConferenceAlberta557205205205textmonographic MEDICINA 1408 SAÚDE MENTAL 2697 DEFICIÊNCIA MENTAL 102334 ASSISTENTE SOCIAL 5602 SERVIÇO SOCIAL 1183 CANADÁ 5046 EUA 5071 61COM6641