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Up the Line is a time travel novel by American science fiction author Robert Silverberg. The plot revolves mainly around the paradoxes brought about by time travel, though it is also notable for its liberal dosage of sex and humor. It was nominated for a Nebula Award for Best Novel in 1969, and a Hugo Award for Best Novel in 1970, finishing behind Ursula K. Le Guin's The Left Hand of Darkness for both awards. It was originally serialized in Amazing Stories in 1969, then issued as a paperback original by Ballantine Books later in that year.