หนังสือ, การปลดปล่อย, ศึกษา, การศึกษา, วรรณกรรม, กระดาษ, การเรียนรู้, เอกสาร, ใกล้ชิด, ตำราเรียน, หน้า
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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