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These records cover the period 1899-1928, with most of the documents dating from 1899-1912. They relate primarily to the activities of the officers and senior managers of EPCCo. Among the correspondents are Edison; Walter S. Mallory, vice president and, later, president; Robert H. Thompson, an investor and director who became president in 1907; Theron I. Crane and his successors as secretary, Willard P. Reid and John E. Horne; William S. Pilling and his successors as treasurer, John F. Randolph and Harry F. Miller. Other EPCCo employees who are correspondents include Edward A. Darling and Frederick Siefke, engineers; Emil Herter and William Simpkin, draftsmen; Herman E. Kiefer, chemist; William H. Mason, superintendent; and Francis R. Upton, sales agent and longtime Edison associate. Included are items concerning the organization of EPCCo and the construction of its cement plant at Stewartsville, New Jersey. Also included is material pertaining to land surveys, production, sales, chemical analyses, quarrying, and product quality. Some of the documents relate to the New Jersey and Pennsylvania Concentrating Works and the Edison Crushing Roll Co.

The following categories of documents have been selected: items reflecting Edison's experiments, views on company policies, and direct intervention in, and supervision of, company matters; overviews, summaries, reports, and general descriptions of operations, technologies, company finances, and marketing strategies; descriptions of company products; and other items that bear substantive Edison marginalia. Also included are documents pertaining to Edison's health, schedule, and family, as well as his relations with investors.

The following categories of documents have not been selected: capital calls; meeting announcements; statements of accounts payable; canceled checks and check books; lists of bills; trial balances; payrolls, vouchers, and labor statements; routine employment applications; price lists and quotations; stationery and blank forms; letters of transmittal and acknowledgment; and routine correspondence with vendors and customers. Also not selected are routine letters, memoranda, reports, and cost sheets in the office files of the vice president (1900- 1903) and president (1917-1922).

Records not selected

Labor Distribution (1900)

This folder covers the period February-July 1900 and contains reports on labor, construction costs, and the administration of the Stewartsville works.

Mallory, Walter S. (1900)

This folder contains correspondence between Walter S. Mallory and his father-in-law, O. W. Miller. The letters concern real estate and other property. Related material can be found in Walter S. Mallory Papers (Thomas A. Edison Papers, Part III (1887-1898)).

Orders For Material (1900)

This notebook contains outgoing correspondence by William Simpkin. The documents concern equipment, supplies, blueprints, and personnel. The correspondents include Walter S. Mallory, Edward A. Darling, Fred C. Devonald, and E. A. Jacques. A few letters pertain to a roaster experiment.

Payrolls (1900)

This folder covers the period April 1900. It contains reports on the distribution of payroll expenses and average wage per employee at the Edison Portland Cement Co., the New Jersey and Pennsylvania Concentrating Works, and the West Orange laboratory.

Unpaid Orders (1900)

This folder contains a copy of an unsigned letter to Walter S. Mallory pertaining to unpaid orders in the amount of $175,508.48.

Weekly Reports (1900)

This folder covers the period May 1900 and contains reports from Walter S. Mallory and Edward A. Darling relating to activities at the Stewartsville works.

Work Statement (1900)

This folder contains a summary of excavation and construction work at the Stewartsville site during the period June-December 1900.

Price Lists and Quotations (1902)

This folder contains correspondence and printed material relating to the purchase of equipment and supplies. Included are letters from dealers and manufacturers of bags and barrels suitable for shipping cement.

Employment Reports (1903)

This folder covers the period September-December 1903. It consists of daily reports relating to the number of employees and hours of labor in specific plants, departments, and positions at the Stewartsville works. Many of the reports are initialed by Edison and Walter S. Mallory.

Explosion and Fire (1903-1905)

This folder contains correspondence and other documents from the period February 1903-March 1905. The documents concern the explosion and fire of March 2, 1903, at the Stewartsville works. The correspondents include Walter S. Mallory; attorney Howard W. Hayes; and the Employers' Liability Assurance Corp., Ltd., of London. The letters contain condolences and lists of employees. Some concern witnesses to the accident and the settlement of liability claims. Many items deal with the death and estate of Edward A. Darling.

Price Lists and Quotations (1903)

This folder contains correspondence and printed material relating to the purchase of equipment and supplies. Included is a catalog for medicinal preparations from Tilden & Co. of New Lebanon, New York.

Shipments (1905)

This folder covers the period July-December 1905. It contains typewritten transcriptions of daily reports on cement shipments. The data includes order number; consignee, buyer, and destination; number of barrels; and price.