Роберт Силверберг

The Masks of Time is a science fiction novel by American authorRobert Silverberg, first published in 1968. It was a nominee for the Nebula Award in 1968. It was published in the United Kingdom under the title Vornan-19.

In Illinois, the one-hundred-foot Cahokia Mound spreads impressively across sixteen acres, and as many as ten thousand more mounds dot the Ohio River Valley alone. The Mound Builders traces the speculation surrounding these monuments and the scientific excavations which uncovered the history and culture of the ancient …