The Magic School Bus is a 9-book series with 9 primary works first released in 1986 with contributions by Joanna Cole and Bruce Degen.
1986 • 5 Readers • 44 pages • 3.7
1987 • 3 Readers • 50 pages • 4
1990 • 4 Readers • 40 pages • 3.5
1997 • 5 Readers • 52 pages • 3
1999 • 3 Readers • 47 pages