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Robert Heinlein - one of my favourites.  This book introduced to me parallel universes.

Robert Heinlein - one of my favourites. This book introduced to me parallel universes.

Time for the Stars

Time for the Stars by Robert Heinlein was published in / For a telepathic twin on an exploratory space voyage only a few years pass, yet, when he returns to Earth his brother is ready to celebrate his ninetieth birthday.

FRANK KELLY FREAS - The Star-Crowned Kings - Robert Chilson - 1975 DAW Books - cover by isfdb - print by tumblr

FRANK KELLY FREAS - The Star-Crowned Kings - Robert Chilson - 1975 DAW Books - cover by isfdb - print by tumblr

Stranger in a Strange Land by Robert Heinlein. NEL 1971. Cover art Bruce Pennington

Stranger in a Strange Land by Robert Heinlein. NEL Cover art Bruce Pennington - this is the cover I remember.

Friday by Robert A. Heinlein

Friday by Robert A. Retro futurism back to the future tomorrow tomorrowland space planet age sci-fi pulp flying car train airship steampunk dieselpunk police cop patrol car

Their world was a giant spaceship, its purpose and destination lost in centuries of drifting among the stars.

Sci-Fi

Universe by Robert Heinlein. Dell Book Their world was a giant spaceship, its purpose and destination lost in centuries of drifting among the stars. That guy has two heads one of them looks pissed off.

Publication: Glory Road Authors: Robert A. Heinlein Year: 1981-01-00 ISBN: 0-450-04860-8 [978-0-450-04860-9] Publisher: New English Library Cover: Tim White

Publication: Glory Road Authors: Robert A. Heinlein Year: ISBN: Publisher: New English Library Cover: Tim White