For ages 7-11 • 192 titles • 16-24 pages • 4 grade levels • 4 boxes (2 science and 2 social studies) per grade level • In each box: 24 books (2 of each title), 48 activity cards,   24 answer cards, and 12 labeled divider cards For ages 5-7 • 80 titles • 8-16 pages • 2 grade levels • 4 boxes per grade level • 10 titles in each box