LEST WE FORGET THEE, EARTH written by Robert Silverberg under the pseudonym "Calvin M. Knox":
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 A hundred thousand years ago, there had been a planet called Earth. It had been a proud world ruling a thousand vassal stars, but its stellar empire had turned upon and annihilated their conquerors, and wiped the name of Earth from the maps of space.
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But Earthmen still survived . . . a strange race of worldless men and women, by tradition advisers to rulers, but never themselves ruling. Wanderers through myriad planets, their origin was a half-forgotten legend.
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That was the situation when a strange quirk of fate sent Earthman Hallam Navarre on an intetrstellar wild goose chase. He had to bring back a strictly mythical treasure to his alien ruler, or die.

People Minus X / Lest We Forget Thee Earth (Classic Ace Double, D-291)

Science Fiction & Fantasy

Raymond Z. Gallun

Calvin M. Knox (pseud Robert Silverberg)

Science Fiction

Ace Books, Inc.

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Books by Calvin M. Knox (pseud Robert Silverberg)

See the best price to sell, buy, or rent books by Calvin M. Knox (pseud Robert Silverberg). BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

People Minus X / Lest We Forget Thee Earth (Classic Ace Double, D-291)