การศึกษา, คณะกรรมการ, ลูกศร, คำสั่ง, บันทึก, หนังสือ การศึกษา, ตัวอักษร, การสอน, โรงเรียน, เรียน, ความรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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