This is the textbook for the 26 episodes of the famous "Guten Tag" course for learning German, which was originally broadcast in the 1950s and 60s. Produced by the Bavarian Broadcasting Service in collaboration with the Goethe Institute.
This one goes along with a TV series. It's also been a good reference. Handy enough to take on a trip with you. Gee I wonder if the TV show is even used anymore?