Category:1978 Motorcycle Trials World Championship

**Motorcycle trials season**
	Yrjö Vesterinen al Trial de Sant Llorenç de 1978 (Matadepera, 12 de març)
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Instance of	FIM Trial World Championship; sports season;
Edition number	4;
Winner	Yrjö Vesterinen (Bultaco, 128);
Organizer	International Motorcycling Federation;
Point in time	1978;
Start time	11 February 1978;
End time	24 September 1978;
Authority file
	Q21077627;
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