Professional historians have noted the educational use of the game.

Historians have noted changes in the content and structure of children's play over the last century.

The idea is much older, and many natural historians have noted the competition between animals.

"There were few social activities in which he did not involve himself", as historians have noted.

Historians note that there is a lot of dubious history involved.

Historians note that Dewey himself had such concerns in the 1920's.

Historians have noted that even during the 12th and 14th centuries the two parties had little interest in learning about each other.

Some historians note that this action had a very direct outcome on the battle itself.

Historians noted the city's gardens that spring produced very little.

But as historians have long noted, the army was short on provisions for both men and horses.