File:Обеспыливание при добыче угля в шахах США. Фиг. 3.7.jpg
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![File:Обеспыливание при добыче угля в шахах США. Фиг. 3.7.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/%D0%9E%D0%B1%D0%B5%D1%81%D0%BF%D1%8B%D0%BB%D0%B8%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5_%D0%BF%D1%80%D0%B8_%D0%B4%D0%BE%D0%B1%D1%8B%D1%87%D0%B5_%D1%83%D0%B3%D0%BB%D1%8F_%D0%B2_%D1%88%D0%B0%D1%85%D0%B0%D1%85_%D0%A1%D0%A8%D0%90._%D0%A4%D0%B8%D0%B3._3.7.jpg/800px-%D0%9E%D0%B1%D0%B5%D1%81%D0%BF%D1%8B%D0%BB%D0%B8%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5_%D0%BF%D1%80%D0%B8_%D0%B4%D0%BE%D0%B1%D1%8B%D1%87%D0%B5_%D1%83%D0%B3%D0%BB%D1%8F_%D0%B2_%D1%88%D0%B0%D1%85%D0%B0%D1%85_%D0%A1%D0%A8%D0%90._%D0%A4%D0%B8%D0%B3._3.7.jpg?20140218155116)
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