By Kumon
By Mari Tudor
By Gavin Hannah
By Tamar Reis-Frankfort
By Clair Baker, Tami Reis-Frankfort
By Helena Matthews
By Pedigree Books Ltd
By Non ap Emlyn
By Stephen C. Curran, Warren J. Vokes
By Guinness World Records
By Jerry Slater, Steff Hutchinson, Julia Sandford-Cooke, Slater, Jerry, Hutchinson, Steff, Sandford-Cooke, Julia
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By Kumon Publishing
By Annie Berthet, Beatrix Sampsonis, Sylvie Pons