- Researching and documenting the evolution of the Woodward Governor Company.
- Research and documenting the history of Fort Collins, Colorado, U.S.A.
- Research and documenting the history of Fort Collins, Colorado, U.S.A.
- Renewable Energy
- Reliance Works Allis-Chalmers later
- RE
- RadialPlant
- Radial engine power plant
- PSG
- Precision. The Woodward Type PG Hydraulic Governors.
- Precision. The Woodward Type PG Hydraulic Governor.
- PGA TEST
- PGA 200 D
- PGA 200 C
- PGA 200 B