article: Jo Evelein
links: Rotterdam Monte Carlo 1920 Summer Olympics Water polo at the 1922 Women's Olympiad London Ladies Waterpolo Club in the Netherlands in 1914 1912 Kleve international aquatics competitions Anna Helweg Swimming at the 1922 Women's Olympiad – 400 metre freestyle Aquatics at the 1922 Women's Olympiad Swimming Kleve De Telegraaf