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- The Arrow A54 Gaseous Fuel Engine data.
- The Arrow A54 Gaseous Fuel Engine data.
- Brad's Diesel Engine History Project.
- Page 3. Information courtesy of the Diesel Progress North American KHL Group Americas LLC.
- Picture credit and Information courtesy of Diesel Progress North American KHL Group Americas LLC.
- Page 2. Information courtesy of Diesel Progress North American KHL Group Americas LLC.
- The Arrow A54 Gaseous Fuel Engine history.
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