กระดานดำ, ชอล์ก, สีดำ, กระดานชนวน, กรอบ, เขียน, การเขียน, ข่าวสาร, คำ, ร่าง, การวาดภาพ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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