03/11/1891 Livor, Henry M to Edison, Thomas Alva
(Ogden Ore Separating Plant) Production difficulties and adjustments; Ore milling and separation
[CJ003]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1891)
[CJ003AAE; TAEM 149:222]
Courtesy of Thomas Edison National Historical Park.