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The gunpowder industry
Saltpeter refinery at Eleutherian Mills (Upper Yard)
Brandywine Creek and Hagley Yard
Unidentified equipment, detail
Pulp keg mill in Hagley Yard
Rolling mills, lower Hagley yard
Eagle Packing House, rear view
Eleutherian Mills - Eagle Dry House
Prismatic press
Steam plant construction, Hagley Yard
Carney's Point, view taken from H10 building
Steam plant, Hagley yard
Correspondence, Thomas Davy to E. I. du Pont de Nemours and Company, 1821-09-19
Hydraulic elevator, Lower Hagley Yard
Twisted piece of metal thrown from wheel mill explosion in Hagley Yard

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