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It should be mentioned that the surface of show jumping main arena used to be grass but is now sand or artificial material. There are videos on youtube from the 1989 European Championships in Rotterdam that show in '89 it was grass. I don't know what year it changed, you'd need to email CHIO Rotterdam. —Preceding unsigned comment added by 81.157.117.167 (talk) 21:42, 28 February 2011 (UTC)[reply]
