Instruction and study (1) Travel (1) Villages (1) Suburbs (1) Social status (1) Social participation (1) Social history (1) Ribs (1) Responsibility (1) Regional planning (1) Motion (1) Life span, Productive (1) Ivory (1) Cities and towns--Growth (1) Cities and towns (1) Blessing and cursing (1) Movements (1) Social life and customs (1) Sexual behavior (1) Practice (1) Motors (1) Estatus social (1) Desarrollo urbano (1) Pueblos (1) Barrios periféricos (1) Costumbres sexuales (1) Viajes alrededor del mundo (1) Sexualidad (1) Responsabilidad (1) Motores (1)