Themes: Biography, Hockey. When Willie O'Ree was young, only white people played in the NHL. That didn't stop him from dreaming of becoming a pro hockey player. A life-changing injury didn't either. By following his passion, O'Ree made his dream a reality and paved the way for others to follow. He continues to break barriers, giving every child the opportunity to play. Blue Delta Books Biographies are Hi-Lo Books about people who have changed our world in profound ways. This series features a diverse group of people. Some are more well-known than others, but all deserve to be highlighted for the positive impact they have had. Each Blue Delta Book features full-color images on every page and tells the person's story from childhood throughout their life. Sure to inspire readers, these impactful biographies are each 48 pages long and include a glossary of key vocabulary words.