ดู, กุญแจ, หนังสือ, เปิดหนังสือ, การศึกษา, ความรู้, หน้า, ความฉลาด, การอ่าน, กระดาษ, พจนานุกรม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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