REFERENCES FROM 1940 TO 1964 ARE ORGANIZED IN FOUR CATEGORIES. THE SECTION ON PROFESSIONAL LITERATURE IS CONCERNED WITH THE ETIOLOGY AND THE PSYCHOLOGICAL, SOCIOLOGICAL, AND MEDICAL ASPECTS OF MENTAL RETARDATION. THE PROFESSIONAL CURRICULUM SECTION IS DEVOTED TO CURRICULUM DEVELOPMENT AND PROGRAM CONTENT FOR TEACHERS. THE GENERAL LITERATURE SECTION LISTS REFERENCES FOR PARENTS, TEACHERS, AND WORKERS IN AREAS RELATED TO MENTAL RETARDATION, AND INCLUDES REFERENCES ON SPEECH, PLAY ACTIVITIES AND RECREATION, HOME INSTRUCTION AND TRAINING, READINESS, GUIDES TO PARENTS, AND UNDERSTANDING RETARDATION. A SECTION OF HISTORICAL LITERATURE CONTAINS MOSTLY OUT-OF-PRINT REFERENCES FROM 1904 TO 1959. PUBLISHERS, PRICES, AND ADDRESSES ARE LISTED. (GW)