Actually, there have only been a few formal surveys for rare plant and animal species.

In 1823, Hiram Tibbetts, an engineer, was employed to make a formal survey for the route.

In 1861, a formal survey of the township was made and blocks offered for sale.

The first formal survey done in western Canada was by Peter Fidler in 1813.

There's been no formal survey here.

German naval officials observed and reported on this Chinese activity during a formal survey of Jiaozhou Bay in May 1897.

By the early 1980s, there was growing dissatisfaction among development experts with both the reductionism of formal surveys, and the biases of typical field visits.

You can use formal surveys to gather this knowledge or ask for their views on a more informal basis.

He and other economists said that while confidence remained low, at least as measured by formal surveys, this summer's budget deal seems to have dispelled some uncertainty.

This was despite there being no formal survey or census done specifically on the topic.