In 1829, the name Decazeville was given to the principal centre of the industry.

The city is the principal economic and cultural centre of Wallonia.

Manila was no longer the principal commercial centre of the East and never again recovered that position.

But only at the end of the century did the district become the principal artistic center of Paris.

The city has a rich history and heritage and today forms the principal center of population in the region.

The statement also emphasizes the home as "the principal center for Jewish religious life."

It is the principal center for astronomical research in Bulgaria.

This zone is the principal center of production and human groups location.

There are two principal centers for nuclear research in Iran.

The town is the principal centre for radio and television broadcasting in the Netherlands.