Thanks! Note to people looking for unicycles in the book:
The U.S. version does not list unicycles/unicycling in its index. Other editions might be equally sketchy. The U.S. book’s index seems very short, so either the book has less records and a lot more pictures, or the index is not a complete listing of everything in there.
Thanks for the welcomes 
If you’re looking for records in other editions, I would suggest looking in the table of contents, and search for anything that could be related to unicycling-i.e. epic journeys, cycling, juggling feats, strength & stamina, etc.