This letterbook covers the period October 1912-January 1913. Most of the correspondence is by Edison and William H. Meadowcroft. Many of the items relate to the commercial and technical development of Edison's alkaline storage battery, including its use in delivery trucks. Additional letters pertain to Edison's phonograph and motion picture businesses; visitors to his laboratory in West Orange; and the inventor's opinions on economic and political matters, as well as his musical tastes. There is also an item concerning the death of Edison's mother-in-law, Mary V. Miller. Among the correspondents are Edison associate Paul H. Cromelin, financier and Progressive Party leader George W. Perkins, and industrialist Charles M. Schwab.

The front cover is marked "T. A. E. From Oct. 19, 1912. To Jan. 8, 1913." The spine is marked with similar information, along with the number "30." The book contains 694 numbered pages and an index. Less than 10 percent of the book has been selected.