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===Primary sources===
===Primary sources===
* Israel, Paul W., ed. ''The Papers of Thomas A. Edison,'' (6 vol
* Israel, Paul W., ed. ''The Papers of Thomas A. Edison,'' (6 vol)
** vol 2: ''From Workshop to Laboratory, June 1873-March 1876'' (1992)
** vol 2: ''From Workshop to Laboratory, June 1873-March 1876'' (1992)
** vol 3: ''Menlo Park: The Early Years, April 1876-December 1877'' (1995)
** vol 3: ''Menlo Park: The Early Years, April 1876-December 1877'' (1995)