06/25/1891 Livor, Henry M to Edison, Thomas Alva
(Ogden Ore Separating Plant; Dickson, William Kennedy Laurie) Production difficulties and adjustments; Ore milling and separation; Rolls and crushers [Marginalia by Edison, Thomas Alva]
[CJ003]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1891)
[CJ003AEO; TAEM 149:374]
Courtesy of Thomas Edison National Historical Park.