An extensive archaeological survey was conducted at the site in June 2009.

I note the results of two extensive local surveys we conducted into beliefs.

An extensive survey of pieces in various print and drawing media.

An extensive survey of the Gulf in 1986 sighted only 31 animals.

Despite extensive surveys, it has not been seen since 1979, and is therefore considered extinct.

We won't have to waste our time in extensive surveys to find out what they want.

With an eye toward seeing that the community got what it wanted in a new library, extensive surveys were conducted.

This group had conducted an extensive survey of real and imagined enemies.

Extensive surveys and geological maps were made at that time.

It plans to spend $700,000 next year on a more extensive survey to define the "nature and extent of contamination" in the park, he said.