This letterbook covers the period March 1897-January 1898. Most of the correspondence is by Edwin I. Olmsted, purchasing agent. There are also letters by Walter S. Mallory, vice-president, and John F. Randolph, treasurer. The documents deal mainly with equipment and supplies. One letter by Edison describes the process of making briquettes. Another item contains a detailed description of a briquette. Some letters deal with the use of respirators and smoke protectors at the Ogden works, the commercial feasibility of expansion into the Canadian market, and public relations regarding ore milling. The spine is marked "13" and is labeled "From March - 19 - 1897 To Jan 31 - 1898 inclusive." The bottom of the spine is also marked "10." The book contains 996 numbered pages and an index. Approximately one percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.