เมือง, สิ่งแวดล้อม, โปสเตอร์สิ่งแวดล้อม, การคุ้มครองป่าไม้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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