หนังสือ, แว่นตา, การศึกษา, วิจัย, ความรู้, ข้อความ, ตำราเรียน, ข้อมูล, วรรณกรรม, ศึกษา, อ่าน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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