03/29/1898 Andress, Fred R to Edison, Thomas Alva
(Ogden Ore Separating Plant; Herter, Emil) Production difficulties and adjustments; Rolls and crushers
[CJ011]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Administrative and Financial Records: Correspondence (1898)
[CJ011ABA; TAEM 149:865]
Courtesy of Thomas Edison National Historical Park.