- THE JAMES LEFFEL AND COMPANY ADVERTISEMENT.
- LEFFEL HYDRAULIC TURBINES.
- James Leffel & Company advertisement.
- IMPULSE TURBINES BY SMITH. BULLETIN 138.
- Elmer Woodward's new oil pressure relay valve water wheel governor ca 1912.
- Woodward... Designers and Builders of Controls for All Prime Movers.
- Fauerbach Brewery bottle, circa 1941.