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Rau competed in the 200 metre hurdles. He placed fifth in his first-round (semifinal) heat, not qualifying for the final.
- De Wael, Herman. Herman's Full Olympians: "Athletics 1900". Accessed 18 March 2006. Available electronically at .
- Mallon, Bill (1998). The 1900 Olympic Games, Results for All Competitors in All Events, with Commentary. Jefferson, North Carolina: McFarland & Company, Inc., Publishers. ISBN 0-7864-0378-0.
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