This folder contains correspondence and other documents relating to the technical and commercial development of Portland cement. Among the items for 1917 are printed copies of the Bureau of Standard's cement specifications and of monthly stock statements issued by the Portland Cement Association. There is also a routine letter from William H. Meadowcroft to consulting engineer Lamar Lyndon regarding the forwarding of Lyndon's suggestions to Walter S. Mallory, president of the Edison Portland Cement Co.

Courtesy of Thomas Edison National Historical Park.