สะพาน, เขื่อน, โครงสร้าง, สถาปัตยกรรม, ฝาย, ล้วนแล้ว แต่, การก่อสร้าง, เหล็ก, ถนน, แม่น้ำ, สะพานรถไฟ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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