- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- 1893 advertisement for the James Leffel & Company.
- The Mechanical News magazine history.
- Edward P. Allis history, circa 1893.
- Allis-Chalmers Company history on governor theory.
- Allis-Chalmers Company history on governor theory.
- Allis-Chalmers Company history on governor theory.
- Allis-Chalmers Manufacturing Company history.
- Edward P. Allis history, circa 1893(Allis-Chalmers Manufacturing Company).
- Limelight on the Lucas Aerospace Company history.
- From the Oldwoodward.com archives.
- Vintage Woodward document history is fun!