This letterbook covers the period February-May 1898. Most of the correspondence is by Walter S. Mallory, vice-president of the company, and Edwin I. Olmsted, purchasing agent. The letters deal mainly with personnel matters, operations at the Ogden works, equipment, and supplies. Some items pertain to work for the New Jersey Zinc Co. in Franklin, New Jersey and to Edison's interest in gold. There are also items relating to Edison's health, the purchase of a large flag for the West Orange laboratory, and an ore milling exhibit at Madison Square Garden in New York City. The front cover is labeled "New Jersey and Pennsylvania Concentrating Works." The spine is labeled "Letter Book E. I. Olmsted & W. S. Mallory from Feb 4 1898 to May 20 1898 inclusive." The bottom of the spine is stamped "5." The book contains 501 numbered pages and an index. Less than 10 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.