Робърт Силвърбърг

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 …

Discusses, among other topics relating to the redwood and the giant sequoia, their discovery and misuse and the chronic conflict between redwood lumbermen and conservationists.