คณะกรรมการ, รูปจำลอง, กรอบ, ฉลาก, บันทึก, ชอล์ก, โรงเรียน, เนื้อไม้, การศึกษา, กระดานดำ, ภูมิหลัง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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