Self-Transcendence 24h Lauf Basel - 100mi SplitSUISwitzerland4–5 May1991100miDistfixed distance race20M 1515 menF 55 women
Self-Transcendence 24h Lauf BaselSUISwitzerland4–5 May199124hTimefixed time race57M 4343 menF 1414 women
Lake Waramaug 50mi Ultra MarathonUSAUnited States28 Apr199150miDistfixed distance race37M 3434 menF 33 women
Lake Waramaug 100km Ultra MarathonUSAUnited States28 Apr1991100kmDistfixed distance race6M 66 menF 00 women
Zane Grey Highline Trail 50 MileUSAUnited States27 Apr199150miDistfixed distance race15M 1212 menF 33 women
Harzquerung Wernigerode-NordhausenGERGermany27 Apr199151kmDistfixed distance race71M 6868 menF 33 women
Marathon des SablesMARMorocco22–28 Apr1991· 6 stages219kmDistfixed distance race20M 1919 menF 11 women
Falls to Gasworks Ultra RunUSAUnited States21 Apr199175kmDistfixed distance race31M 2626 menF 55 women
100 km du Périgord Noir, BelvesFRAFrance20 Apr1991100kmDistfixed distance race281M 252252 menF 2929 women
Lewis and Clark Trail 50 MileUSAUnited States20 Apr199150miDistfixed distance race4M 44 menF 00 women
Ruth Anderson Ultra 100kmUSAUnited States20 Apr1991100kmDistfixed distance race13M 1212 menF 11 women
Marcialonga Veneta di Montagnana di 100 kmITAItaly20–21 Apr1991100kmDistfixed distance race152M 143143 menF 88 women
Int. Deutscher 100km-Lauf des SSC Hanau-Rodenbach - 50km SplitGERGermany20 Apr199150kmDistfixed distance race1M 00 menF 11 women
Int. Deutscher 100km-Lauf des SSC Hanau-RodenbachGERGermany20 Apr1991100kmDistfixed distance race205M 184184 menF 2121 women
Arthur Cresswell Memorial Marathon Bergville to LadysmithRSASouth Africa14 Apr199152kmDistfixed distance race2M 11 menF 11 women
24 ore di Portici su pista - 100km splitITAItaly13–14 Apr1991100kmDistfixed distance race1M 11 menF 00 women