Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911 Water Purification Plant, Washington, D. C. Results of Operation.

American Society of Civil Engineers

《Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911 Water Purification Plant, Washington, D. C. Results of Operation.》，American Society of Civil Engineers。这是一部关于自然、科学、艺术的公版作品，适合在安静的片刻里慢慢读下去。