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This series contains correspondence, minute books, account books, letterbooks, and other records pertaining to the operations of the various Edison companies. Related documents can be found in other series. For example, the Document File Series contains numerous folders with titles such as "Electric Light - Edison Electric Light Co.," "Mining - Edison Ore Milling Co.," and "Phonograph - North American Phonograph Co." Documents concerning Edison's mining and ore milling ventures can also be found in the Alexander Elliott, Jr. Papers and Walter S. Mallory Papers (Special Collections Series). Official reports, promotional brochures, and other printed material issued by the Edison companies can be found in the Primary Printed Series.

The records of many of the companies appearing in Part III extend beyond the period 1887-1898. For those companies that were active primarily during the 1880s and 1890s (for example, the New Jersey and Pennsylvania Concentrating Works), the few selected documents from the period after 1898 have been reproduced in Part III. For those companies such as the National Phonograph Co. and the Edison Phonograph Works that remained active during the 1900s, only the significant documents from the period 1887-1898 appear in Part III.

Courtesy of Thomas Edison National Historical Park.