12/15/1896 Edison, Thomas Alva to Hammer, William Joseph
(Aylsworth, Jonas Walter) Chemicals, chemical products, and chemical processes
[LB059]  General Letterbook Series: LB-059 (Oct 1893-July 1894, Sep 1894-Apr 1895, (Nov-Dec 1895, Dec 1896-Jan 1898)
[LB059245A; TAEM 143:518]
Courtesy of Thomas Edison National Historical Park.