- Woodward Hydro Manual Number 07093
- Woodward Hydro Manual Number 07092B
- Woodward Hydro Manual Number 07089
- Woodward Hydro Manual Number 07087A
- Woodward Hydro Manual Number 07086B
- The Woodward Governor Company's Hydro market share before they sold out to the General Electric Company.
- Practical guide to model railroading history.
- Page 8.
- Page 7.
- Page 6.
- Page 5.
- Page 4.
- Model Railroading is fun!
- First printed in 1952.
- Contents