This letterbook, which covers the period April 1901-July 1903, consists of outgoing correspondence written by Walter S. Mallory. Most of the letters deal with Mallory's friends and family, his personal business contacts, and his private interests. Some of the items relate to Mallory's work for Edison's companies, including the Edison Portland Cement Co., the Edison Storage Battery Co., and the New Jersey and Pennsylvania Concentrating Works. There are also letters relating to foreign ore milling enterprises, Edison's health, and the phonograph. The front cover is labeled "Personal - Letters. Of W. S. Mallory, V. P., From April 17 1901. To July 27/1903." The spine is stamped "Letters" and is labeled "Personal Letter Book of [W.] S. Mallory [Fr]om [A]pril 17, 1901." There are 953 numbered pages and an index (not selected). Approximately 5 percent of the documents have been selected. Some letters are written in very faint green or blue ink and may be difficult to read.