31 Book Hardy Boy Mystery Hardcover Collection, In Excellent Condition. I have numbers 3-10, 12-16, 20, 24, 33-35, 41-44, 50-58, plus the Handbook which is used but in good condition. Copyrights from 1959 to 1990. These books are a classic for young readers. They never go out of date. Many collectors have the additional copies to make up for the missing numbers. Start your collection now for a little over $1 a piece. That's less than e-bay! This would be a great gift for the holiday season. Call or text me at .