This was followed by significant research activity during the 1970s and early 1980s.

A secondary subject is also followed during the first two years.

WE have now followed man's career during some forty million years.

More than 600 songs were to follow during his long career.

However this was followed by something even worse, during the next generation.

Some things he knew because they had followed each other during a particular waking period.

"Have you noticed yourself being watched or followed during the past three days?"

This was followed by large growth in the high-tech industry during the 1990s and 2000s.

This activity was followed by a period of rest during August.

Three more were to follow during the course of the mid to late 20th century.