Die Arnoldkinder is a 4-book series with 5 primary works first released in 1938 with contributions by Enid Blyton.
1938 • 4 Readers • 164 pages • 2.5
1940 • 1 Reader • 163 pages • 3
1941 • 1 Reader • 160 pages • 3
1 Reader • 3
1953 • 2 Readers • 198 pages • 3