06/04/1891 Livor, Henry M to Edison, Thomas Alva
Production difficulties and adjustments; Ore milling and separation [Marginalia by Edison, Thomas Alva]
[CJ003]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1891)
[CJ003ACV; TAEM 149:305]
Courtesy of Thomas Edison National Historical Park.