This folder contains correspondence and other documents relating primarily to the procurement of samples for experimentation; demonstrations of Edison's crushing technologies; and the disposal of equipment and supplies from the New Jersey and Pennsylvania Concentrating Works. The correspondents include Edison, Walter S. Mallory, and Francis R. Upton. Some of the letters pertain to meetings with Edison. A few items concern patent rights.

Less than 5 percent of the documents have been selected. The unselected material includes a list of elevators and conveyors; contract proposals; pamphlets about hydraulic cement; and notes, calculations, specifications, and blueprints relating to crushing rolls, grinding rolls, screens, and other equipment. Also not selected is a notebook by Upton containing a memorandum about the physical properties of cement and the output of the American cement industry.