06/24/1891 Edison, Thomas Alva to Livor, Henry M
(Ogden Ore Separating Plant; Dickson, William Kennedy Laurie) Production difficulties and adjustments; Ore milling and separation [Attachment/Enclosure]
[CJ003]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1891)
[CJ003AEJ; TAEM 149:369]
Courtesy of Thomas Edison National Historical Park.