Subject
- Community-based social services1
- Copper ores -- Peru1
- English language -- Acquisition1
- Geology, Economic -- Peru1
- Language acquisition1
- Magmatism -- Peru1
- Mines and mineral resources -- Peru1
- Ore deposits -- Peru1
- Poor children1
- Poor children -- Services for1
- Porphyry -- Peru1
- Preschool children1
- Preschool children -- Services for1
- Readiness for school1
- Self-control in children1