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- Brad's Pierce Governor unit in the collection.
- The Pierce Governor Company.
- Marquette Hydraulic Governors.
- HORIZONTAL GAS ENGINES SMALL and MEDIUM SIZE.
- HORIZONTAL GAS ENGINES SMALL and MEDIUM SIZE. Published by the VACUUM OIL COMANY.
- A Horizontal Gas Engine History Project.
- Published in 1916.
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- Diagram of the engine cooling system.
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