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Short story. Illustrated by Freas.

Scope and Contents Science feature article: Illustrations by Elliott Dold, Jr. Appeared in the collected works [i]The Best of L. Sprague de Camp[/i], published in 1978, reissued in 1986; and [i]Years in the making: The Time-Travel Stories of L. Sprague de Camp[/i], published in 2005. Appeared in the anthologies [i]Coming Attractions[/i], edited by Martin Greenberg, published in 1957; and [i]The Analog Anthology #1[/i], edited by Stanley Schmidt, published in 1980, reissued in 1981 under the title [i]Analog's...

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Short story. Charles Schneeman, illustrator. Appeared in the anthologies [i]A Treasury of Science Fiction[/i], edited by Groff Conklin, published in 1948, reprinted in 1951; [i]Gates to Tomorrow[/i], edited Andre Norton and Ernestine Donaldy, published in 1973; [i]A Treasury of Science Fiction[/i], edited by Groff Conklin, published in 1980; [i]The SFWA Grand Masters, Volume 1[/i], edited by Frederik Pohl, published in 1999.

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Novelet. Illustrated by Hunter.

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Short story. Illustrations by Jack Binder. Part of the Johnny Black Series. Appeared in the collected works [i]The Best of L. Sprague de Camp[/i], published in 1978, reissued in 1986. Appeared in the anthologies [i]Modern Masterpieces of Science Fiction[/i], edited by Sam Moskowitz, published in 1965, reissued in 1974; and [i]Dorway Into Time[/i], edited by Sam Moskowitz, published in 1966, reissued in 1974.

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Noveltte. Illustrations by Cartier.

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Serial: part 3 of 4 parts. Illustrations by Cartier. Part of the Viagens Interplanetarias Series. Published as a novel in 1963 under same title.

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Serial: conclusion. Illustrations by Cartier.

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Short story. Illustrations by Cartier. Part of the Viagens Interplanetarias Series.

Scope and Contents Short story. Illustrations by Elliot Dold. Appeared in the collected works [i]Years in the Making: The Time-Travel Stories of L. Sprague de Camp[/i], published in 2005. Appeared in the anthologies [i]First Flight[/i], edited by Damon Knight, published in 1963; [i]Now Begins Tomorrow[/i], edited by Damon Knight, published in 1969; [i]First Voyages[/i], edited by Damon Knight, Martin H. Greenberg and Joseph D. Olander, published in 1981; [i]Tales in Time[/i], edited by Peter Crowther,...