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| The Classic Motor Cycle January 1989 |
1903 Vindec Special
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| https://www.heli-archive.ch/en/helicopters/in-depth-articles/sikorsky-s-55h-19/ |
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| http://www.airwar.ru/enc/ch/wessex.html |
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| Roadless County & Other Conversions, Allan T.Condie Publications, Nuneaton |