หนังสือ, ห้องสมุด, การศึกษา, ความรู้, ศึกษา, โรงเรียน, วิจัย, การอ่าน, วรรณกรรม, อ้างอิง, ผู้อ่าน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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