07/15/1891 Perry, William S to Straker, Tooke
(Edison, Thomas Alva) Carbon, coal, glass, ceramics; Briquettes and bricker machinery
[LM204]  Company Records Series -- New Jersey and Pennsylvania Concentrating Works -- Letterbooks -- Letterbooks by Butler, Livor, Mallory, et al.: LM-204 (Apr-July 1891)
[LM204827; TAEM 152:822]
Courtesy of Thomas Edison National Historical Park.