หนังสือ, ห้องสมุด, กอง, เก่า, การอ่าน, ความรู้, วรรณกรรม, การศึกษา, วิจัย, การเรียนรู้, ตำราเรียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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