They were made in an intense period of activity approximately from 1542 to 1548.

After a period of little activity, things began to pick up.

This was something that had never happened before during a period of activity.

The period of activity for republican groups is shown in green.

We are now in the middle of a period of high activity.

Add periods of physical activity throughout your day to help keep bones strong.

"And rest between periods of activity is nature's way; here as on earth."

Their major period of activity occurred during the late 1970s through the early 90's.

His astronomical period of activity extended from 1896 to 1907.

His period of activity was from 1678 to 1682 or 1683.