Here is a book I found last week end "Berlin Haupstadt der DDR" (Berlin Capital of GDR). It was printed in the 70's in GDR. I'm so happy to have found it, all the more as it shows the former "Palast der Republik" (Palace of the Republic) from outside and inside. It was destroyed just before we moved to Berlin and we never had a chance to visit it..
Have a great week!