This folder contains correspondence and other documents relating to the administrative and financial affairs of the Edison Portland Cement Co. Included are items pertaining to Edison's role as the chairman of the board of directors, market conditions in the cement industry, and the participation of the company in trade associations. Also included is correspondence concerning the commercial exploitation of poultry grit and pulverized limestone—two byproducts of cement production—and the stake of railroads in the development of agricultural properties. In addition, there are letters regarding stock transactions connected with the estate of Robert H. Thompson, visitors to Edison's laboratory, and the procurement of a Christmas tree for Glenmont, the Edison home in Llewellyn Park. Most of the correspondence is by company president Walter S. Mallory and company treasurer Harry F. Miller. There are several letters written by Edison or bearing his marginalia.

Approximately 10 percent of the documents have been selected. The material not selected consists of duplicates; letters of transmittal and acknowledgment; monthly statistics and other periodic statements concerning sales, production, and accounts receivable; and other routine financial material.