Account of official British trial which included various American types.
The British motorcycle trials
Aufsatz (Zeitschrift)
British motorcycle specifications
Engineering Index Backfile | 1925
Engineering Index Backfile | 1920
|Development of RTL250F Four-stroke Engine Trials Motorcycle
British Library Conference Proceedings | 2005
|Popularity of lightweights apparent at British Motorcycle Show
Engineering Index Backfile | 1923
London. British motorcycle builders turn to four-cylinder engines
Engineering Index Backfile | 1928
|