Following intensive surveys, the extinction of this bird was confirmed in 1986.

The other studied the work of community nurses, using an intensive survey combined with diary-keeping.

These intensive surveys were supplemented by less detailed assessments from the rest of Europe.

This cluster was subjected to an intensive photographic survey, which allowed astronomers to track the motion of its stars.

Then why did you choose to make such an intensive survey of it?

From 1907 through 1916, he and his wife conducted an intensive survey at the Public Record Office in London.

However, it has a loud and distinctive call, and intensive surveys have failed to find any since 1987.

The inspections followed an initial inspection in 1985 that was part of an intensive survey of the entire airline industry.

Recent intensive spawning surveys from 1990-2000 indicate that only about 600 fish (range 185 to 1135) now use the river.

Despite intensive surveys of the Colorado mayflies, this species has not been collected in the past 50 years.