This folder contains correspondence and other documents relating primarily to market conditions, company finances, and operations and experimental activities at the Stewartsville works. Most of the letters are to or from Edison, Walter S. Mallory, and William H. Mason. Among the other correspondents are Herman E. Kiefer, Harry F. Miller, and Francis R. Upton. Included are letters pertaining to the washing plant and the kiln and to dust loss and coal consumption. Some of the correspondence concerns high-pressure pumps, hydraulic stripping, coal feeds, chalk briquettes, and grinding tests. In addition, there are letters dealing with the Association of Licensed Cement Manufacturers and the monthly shipments of leading cement companies; and items relating to lime fertilizer, Edison Waterproofing Paint, and the Edison Crushing Roll Co. Also included are letters pertaining to the receivership of the New Jersey and Pennsylvania Concentrating Works and a postcard containing a view of the Stewartsville works.

Approximately 50 percent of the documents have been selected. The unselected material includes prospecting and drilling reports, as well as items regarding royalties from Edison's crushing rolls.