Genehmigt für d. Gebrauch in Schulen durch Education and Cultural Relations Division, Office of Military Government for Germany (US) am 1.VIII.1949, file no. GE-IA-350.01 (Germany)
Genehmigt für den Gebrauch in Schulen durch Education and Relgious Affairs Branch, Office of Military Government for Germany (US) am 15.VII.46, file no. GE-IA 350.01 (Germany)