Title: Deutsch für Ausländer
First published: 1955
Description: A course in German as a foreign language.
It is completely in German and comprises three levels:
Teil 1: Leichter Anfang
Teil 2: Schneller Anfang
Teil 3: Deutschlandkunde
The audio is on a dozen reel=to-reel tapes for each of the first two parts and two very long tapes for the last part.
There are copious laboratory drills for each chapter.
It is surely the prince of all language courses.