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Starman's Quest is a science fiction novel by author Robert Silverberg. It was published in 1958 by Gnome Press in an edition of 5,000 copies, of which only 3,000 were bound. It was reprinted as a second edition in hardcover by Meredith Press in 1969.

The Second Trip is a 1972 science fiction novel by Robert Silverberg. Prior to its publication by Doubleday, it was published in serialized form in Amazing Stories from July to September 1971.

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 …