The Laughing Dragon of Oz was a book written by L. Frank Baum's son Frank Joslyn Baum. With this book came some controversy. Frank J. felt that his was the natural successor to the Oz books. He tried to get "Oz" trademarked in his name and get Reilly & Lee to stop publishing the Oz books. It was his mother, who made the deal with the publishers, who had to sue him for the trademark. When The Laughing Dragon was published by Witman, Reilly & Lee sued them and the book quickly went out of print.