This folder contains correspondence and other documents relating to company finances, market conditions, and experimental activities at the Stewartsville works. Most of the letters are addressed to Edison. Among the other correspondents are Walter S. Mallory, who became president of EPCCo after the death of Robert H. Thompson in 1910, and company officials Herman E. Kiefer, William H. Mason, and Harry F. Miller. Some of the letters discuss the death and funeral of Thompson. There are also numerous letters concerning kiln tests, along with other items pertaining to grinding tests, dust, and compressed chalk. A few documents deal with issues of product quality, such as hair cracks and slow setting or slow hardening. One item indicates the location of accounting records relating to the installation of the giant intermediate rolls at the New Jersey and Pennsylvania Concentrating Works in 1893 and 1894. In addition, there are documents pertaining to other cement manufacturers and trade associations, along with letters regarding the company's withdrawal from the Association of Licensed Cement Manufacturers. Some of the correspondence relates to publicity for Edison's concrete house; to a trade show for the cement industry in New York City; and to the company's monthly sales brochure, The Edison Aggregate. Other letters deal with properties at Menlo Park, New Jersey, and Iona Island, New York, and with litigation involving the New Jersey and Pennsylvania Concentrating Works and members of the Cutting family of New York.
Approximately 20 percent of the documents have been selected. The unselected material includes items concerning crushing roll contracts, royalties, and expenses; semimonthly dealers' records; monthly statements of cement sales; and bills of lading and shipping instructions for cement bags.