10/14/1891 Swarts, W P to Edison, Thomas Alva
(Ogden Ore Separating Plant) Production difficulties and adjustments; Rolls and crushers
[CJ003]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1891)
[CJ003AFR; TAEM 149:417]
Courtesy of Thomas Edison National Historical Park.