This folder contains correspondence and other documents relating primarily to the company's directors, officers, and investors, as well as to operations at the Stewartsville works. Most of the letters are to or from Edison, Walter S. Mallory, Emil Herter, and William H. Mason. Other correspondents include Robert H. Thompson, who succeeded Edison as president of EPCCo in 1907, and Herman E. Kiefer, who replaced Edward P. Dinan that year as the company's chemist. Included are several letters in Edison's hand concerning color experiments with cement. There are also documents pertaining to tests with clinker and to breaking tests on bags for shipping cement, as well as to experiments with the humidor, conveyor, and duster. Additional letters relate to Edison's greenhouse at Glenmont; publicity about concrete houses; EPCCo's agent in Cuba and Puerto Rico; cement sales in Canada; and the construction of subways in New York City. Also included are inquiries about Edison's crushing rolls and milling technologies; and items regarding product quality, competitors, and trade associations.

Approximately 30 percent of the documents have been selected. The unselected material includes reports on construction work, operations, and quarry samples. Some of the unselected items concern company finances, equipment and supplies, and limestone shipments.