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These two letterbooks cover the period December 1901-May 1914. The books contain correspondence by Robert A. Bachman, Patrick Brady, Fred C. Devonald, and other laboratory storekeepers. Most of the letters pertain to routine orders of equipment and supplies for the laboratory. The selected items include letters illustrating Edison's involvement in the purchase and disposition of supplies and in the progress of experimental projects. Also included are letters by Robert A. Bachman, the master machinist at the laboratory, relating to the progress of construction at the Edison Portland Cement Co., the design and construction of molds for Edison's concrete house, and the purchase and repair of automobiles used to test Edison storage batteries. Among the unselected items are letters to various billing and receiving clerks at the Edison Storage Battery Co. and the Edison Portland Cement Co., as well as a few letters concerning the shipment of supplies to Edison's winter home in Fort Myers, Florida, to John V. Miller in Ontario, and to other locations.