- James Leffel & Company advertisement.
- LEFFEL QUALITY...
- CATALOG M FORWARD PAGE.
- Catalogue for the vertical samson turbine installation, circa 11-13-1944.
- Elmer Woodward's new oil pressure relay valve water wheel governor ca 1912.
- IMPULSE TURBINES BY SMITH. BULLETIN 138.
- Leffel hydraulic turbines since 1862.
- LEFFEL HYDRAULIC TURBINES.
- Leffel Turbines...
- resolver
- SAMSON TURBINE CATALOGUE.
- SAMSON WATER TURBINE CATALOGUE.
- SPECIFICATIONS FOR SIZE C WATER WHEEL GOVERNOR.
- SPECIFICATIONS FOR SIZE D WATER WHEEL GOVERNOR.
- THE JAMES LEFFEL AND COMPANY ADVERTISEMENT.