However, during that time he was also active in teaching and historical research.

However, he devoted most of his time to historical research.

Population composition is also a very important part of historical research.

He gave a new direction to methods of historical research.

Oral history has become an international movement in historical research.

What we know about the people in these portraits comes from historical research.

For some years there has been a huge amount of effort going into historical research on Africa.

The book is based on real historical research into Mozart's last days.

The agency might have been looking for mercury had it done its own historical research, he said.

That it may become a part of regular historical research in the future seems a good possibility.