Two books of commentaries proved indispensable for the replanting scheme.

There was no bathtub but a fold-down seat in the shower proved indispensable.

His materials proved indispensable for several generations of Russian literary historians.

Most industry insiders say his efforts to develop global standards for transmitting data have proved indispensable to the Internet's growth.

She proved indispensable as an editor, writer, and shaper of the magazine's advertising policy.

And it should recognize that private citizens, working in concert with their government, can prove indispensable to success in the war on terror.

It's proving indispensable to the aviation industry and to astronomers.

One of the less noted but highly significant areas in which government has proved indispensable is the environment.

Only when operating in concert with conventional Allied units were the resistance groups to prove indispensable.

Since Freddie's birth, she had proven not only efficient but indispensable.