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USA Water Polo on X: "Thank you to all the referees from all across the country and FINA for coming out to referee #2019JOs! #JO50 https://t.co/ziGkNNTCZl" / X
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A referee with a whistle is seen during the match between team of... Photo d'actualité - Getty Images
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TRIESTE, ITALIE - JANVIER 22: Arbitre Matan Schwartz pendant le match entre la Slovaquie et la Grèce aux Jeux Olympiques de Polo d'eau pour femmes qualification Tou Photo Stock - Alamy
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World Water Polo Referee's Association - Explaining to young referee colleague, how we whistled, a long time ago, with flags... | Facebook
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