Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Minaret and Archaeological Remains of Jam' has mentioned 'Soviet' in the following places:
Occurrence Sentence Text Source
Later, Werner Herberg conducted limited surveys around the site in the 1970s, and Ralph Pinder-Wilson completed his major study of the site in the same decade, before the Soviet invasion of 1979 once again cut off outside access.
However, after the Soviet invasion of Afghanistan, no efforts were made.