One of the first known studies of this phenomenon was conducted by Robert Hooke in 1665.

Current known studies include only work being done at the University of Kansas.

This is the largest known study of residential solar installers to date.

There are no known studies of the many reptiles, amphibians, insects, invertebrates or plants living in the valley.

This is the only known scientific study that has been conducted on the site.

To the left is one of Rusinek's better known studies.

Now, more than 30 years later, she has sold that painting, the only known nude study by the illustrator of homey America.

It is also believed to have antimicrobial properties for bacteria, however there are no known studies that demonstrate its efficacy.

It is the last and most important of all known studies for the print.

Perhaps because the proportion of nonwhites in Spain is so small, there are no known studies or statistics here on the subject.