อุปกรณ์การเรียน, เครื่องเขียน, บันทึก, บทคัดย่อ, เอกสาร, รายงาน, สำนักงาน, สมุดบันทึก
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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