Encyclopedia Brown is a 16-book series with 16 primary works first released in 1963 with contributions by Donald J. Sobol.
1963 • 26 Readers • 128 pages • 4
1965 • 6 Readers • 96 pages • 4
1974 • 2 Readers • 73 pages
1985 • 3 Readers • 96 pages • 4
1990 • 1 Reader • 92 pages
2010 • 1 Reader • 84 pages
2012 • 1 Reader • 96 pages