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1 Hercules Powder Company1918-07-15Image
2 Hercules Powder Company1918-07-15Image
3 Hercules Powder Company Interior, Powder Barrels1918-07-15Image
4 Portland Cement Company, Steam from Cement Hoppers1918-07-15Image
5 Portland Cement Company, Steam from Cement Hoppers1918-07-15Image
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