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- Allis-Chalmers Company history on governor theory.
- Edward P. Allis history, circa 1893.
- The Mechanical News magazine history.
- 1893 advertisement for the James Leffel & Company.
- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- JAMES LEFFEL & COMPANY
- ILLUSTRATED HAND BOOK, CIRCA 1886.
- The James Leffel & Company's factory
- INTRODUCTION
- Page 4.
- Page 5.
- Page 6.
- Page 7.
- Page 8.