- Vintage machine shop manufacturing history project.
- Hydroelectric power history project.
- Woodward and Leffel Company history.
- Woodward and Leffel Company history.
- Woodward and Leffel Company history.
- HYDROELECTRIC POWER RESOURCES OF THE U.S.A. PROJECT.
- TABLES OF DEVELOPED HYDRO PLANTS IN THE U.S.A.
- XIX
- XV
- XVI
- XVII
- XVIII
- XX
- XXI
- XXII