10 Who HQ Books (Who? What? Where?): Where Is the Great Barrier Reef? Who Was Christopher Columbus, Wolfgang Amadeus Mozart, Alexander Hamilton, Anne Frank, Milton Hershey, Walt Disney, Cesar Chavez, Mister Rogers, and Oprah Winfrey. Penguin Workshop, 2003-2019, about 100 pages each. Ages 7-10 years. Paperbacks in excellent condition. Text only. Cash or Venmo. Discount on multiple items.