geography/travel, East Germany, science, astronomy, Potsdam Babelsberg observatory, astromers Gerhard Felsmann and Martin Lange at work, , Additional-Rights-Clearences-Not Available

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Keywords: 1960s, 20th, astromers, astronomy, babelsberg, books, century, east, gdr, geography, germany, historic, historical, observatory, office, people, potsdam, science, scientists, travel