Internationale Olof-races 1980 in Zandvoort — 500cc klasse met aan kop Randy Mamola (2), Will Hartog (44), Middelburg (22) Kenny Roberts (1) en Dick Alblas (23 ) — Foto: Antonisse, Marcel / Anefo. Licentie: Set B: Rechtenvrij / Publiek Domein. Bron: Nationaal Archief. http://hdl.handle.net/10648/ace7c714-d0b4-102d-bcf8-003048976d84 — Haarlem 1980
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