กระดานดำ, ชอล์ก, โรงเรียน, คณะกรรมการ, การศึกษา, ออกแบบ, การวาดภาพ, ธุรกิจ, กรอบ, สำเนา, ว่างเปล่า
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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