อุตสาหกรรม, ปิโตรเลียม, ปล่องไฟ, เอทิลีน, เศษส่วน, มอสมอร์แรน, ก็อตแลนด์, ขลุ่ยผิว, มลพิษ, สหราชอาณาจักร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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