N7432.5 - Outsider Art N71.5 - Art and Mental Illness
Other more general sections NK789 -- Decorative Arts N6487 -- Museum Catalogs RC512 -- Psychopathology (in Medicine)
700 -- The Arts (700.103 particularly) 709 -- Historical, areas, persons treatment (includes Outsider Art, 709.04 particularly) 745 -- Decorative Arts (includes Art and Mental Illness)