หนังสือ, อ่าน, ศึกษา, เรียน, ความรู้, วรรณกรรม, การศึกษา, ที่คั่นหนังสือ, ตำราเรียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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