He began growing them commercially in 1931, but the boom did not begin until years later.

People who bought their homes before the boom began are still, of course, living in houses worth much more than they paid for them.

The boom began in England almost a century ago.

American diplomats say the boom began early this summer and has built steadily.

The theater-building boom began during flush times for the movie business.

A second boom began following the discovery of silver in 1876-77.

The Spanish economy's long boom was beginning to turn to bust.

The real boom in infrastructure spending, though, has not even begun.

Until the current boom began, such machines turned up in the unlikeliest places.

This boom continued into the mid-1980s and later began again.