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Princess Katie and the Mixed-up Potion (The Tiara Club at Silver Towers)
Princess Katie and the Mixed-up Potion - The Tiara Club at Silver Towers Author:Vivian French Princess Katie is going on a field trip to meet a real witch. But when Witch Windlespin teaches the princesses how to make a magic potion, something goes terribly wrong.
Library hardbound version of ISBN 9780061124433 paperback, and lists this same ISBN.