- The Woodward Governor Company's smallest water wheel governor.
- Amos Woodward's smallest size 4 governor next to the most complicated jet engine governors.
- A Woodwardology project since 2007.
- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.
- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.
- WOODWARD GOVERNOR COMPANY WATER WHEEL GOVERNOR DATA SHEET INDEX.