"You're the one irreplaceable piece of this puzzle," Uhura had told him when the conference had started to take shape.

Copyright records are not only a reference to works that are or were under copyright protection but also an irreplaceable piece of Americana.

The first is that it provides $700 million for the Land and Water Conservation Fund, a long-neglected program for acquiring irreplaceable pieces of the natural landscape.

If I wipe out the schematics and certain irreplaceable pieces of manufacturing apparatus-fleck-etchers, photonic alloying machines, mindcontrolled micromanipulators-no one will ever build the Guderian device here in the Pliocene.

"I was taught that the service class was an irreplaceable piece of the Cardassian mosaic," I replied with crude irony.

Gone were many irreplaceable pieces of Council history.

But the main fear is that the plant will corrupt an irreplaceable piece of visual history, an outcome the Governor cannot want.

You have killed an irreplaceable piece of equipment.

All of us, whatever our creed, nationality, or political viewpoint, lost an irreplaceable piece of the common heritage that binds us together on this earth.

The numbers say that baseball - even as it plunges ahead into the modern global market - is at risk of losing a most extraordinary part of the 20th century, an irreplaceable piece of itself.