This is a Vintage J.K. Rowling Harry Potter Boxed Set, 1-4, Paperback, First American Edition 1999.
The collection includes:
1st Book: Harry Potter and the Sorcerer's Stone (Year 1)
2nd Book: Harry Potter and the Chamber of Secrets (Year 2)
3rd Book: Harry Potter and the Prisoner of Azkaban (Year 3)
4th Book: Harry Potter and the Goblet of Fire (Year 4)