But federal financing is a crucial source of medical research dollars.

The stable and bunkhouse may turn out to be crucial sources of evidence.

Rightly, he sees it as a crucial source for, and form of, popular culture.

Because this music was not written, the oral performances are a crucial source.

Those transit fees are a crucial source of income for the government.

State spending, as a result, has proved to be a crucial source of money for many university researchers and companies.

He thus placed himself between the Romans and their crucial source of supply.

They are a crucial source of information on the events taking place in third countries.

While new to biologists, the idea that fog can be a crucial source of water has in fact been around for some time.

Gas and oil revenues are a crucial source of government income.