The Great Brain is a 8-book series with 8 primary works first released in 1967 with contributions by John D. Fitzgerald, Ron McLarty, and Mercer Mayer.
1967 • 15 Readers • 192 pages • 4.6
1969 • 4 Readers • 1 page • 5
1974 • 2 Readers • 150 pages
1995 • 2 Readers • 128 pages