This letterbook covers the period January-May 1909. Most of the correspondence is by Edison, Harry F. Miller, and George A. Meister. Many of the letters pertain to laboratory work and supplies and to Edison's accounts with the Edison Portland Cement Co. and J. P. Morgan & Co. Numerous letters defer business for the duration of Edison's vacation in Fort Myers, Florida. In addition, there is correspondence involving the iron ore concentration plant in the Dunderland region of Norway; improvements in Edison's alkaline storage battery; and the manufacture of batteries by Sigmund Bergmann in Berlin, Germany. Several letters detail ongoing progress in the development of Edison's concrete house. Included is a letter in which Harry F. Miller calculates the expected cost of a six-room house, as well as a letter in which Edison explains how affordable housing can function as a means of social uplift for the working class. There is also a letter to Horace F. Parshall in which Edison describes a storage battery being produced for use in a General Electric Co. streetcar. Among the items relating to personal matters are letters regarding Edison's family, health, finances, and charitable donations. Also included is a letter to William J. Dealy in which Edison reminisces about his days as a telegraph operator in Memphis, Tennessee.
The label on the front cover contains the following notation: "Thomas A Edison Personal From Jan 15th 1909 To May 5th 1909." There is an inscription on the spine with similar information. The book contains 701 numbered pages and an index. Approximately 10 percent of the book has been selected.