Personally owned, smoke & pet free home. Pages still crisp. This vintage Discovery Toys Question Book Set Series is tailored for children ages 4-9, making it perfect for homeschooling purposes. The illustrated books cover topics such as school, social situations, history, and mathematics & sciences. Published in the 1980s by Discovery Books, these English-language paperback books offer a unique and educational experience for kids with a focus on engaging storytelling and colorful illustrations. The set includes five books with the previous owner's name inscribed inside, adding a personal touch to this nostalgic collection.