This letterbook covers the period March 1898-January 1901. Most of the correspondence is by Francis R. Upton, sales agent for sand. The letters deal mainly with the marketing of sand. A few of the items pertain to exhibitions in New York and Philadelphia. One letter is a reminiscence by Upton of electric light experiments at Menlo Park in the late 1870s. There is also a letter regarding the use of storage batteries in automobiles. The front cover is marked "N. J. and Pa. Con. Works Sand Letters From - March 4, 1898 To - January 16, 1901." The book contains 494 numbered pages and a partial index. Only 6 letters have been selected. Courtesy of Thomas Edison National Historical Park.