Resoluciones de la Asamblea General (26 y 27 períodos de sesiones) y por el CES (51, 52 y 53 período de sesiones) relacionadas con el 15o Período de Sesiones = Resolutions adopted by the General Assembly (26 and 27 session) and by the ESC (51, 52 and 53 session) which have relation with the work of the 15th Session of the Commission