Rivers of Time Author:L. Sprague De Camp A Nebula Award-winning Author Time travel came in time to save Reginald Rivers' livelihood: guiding big game safaris. The world from Paleocene to Pleistocene offers bigger game than any in the modern world. Anyone who could pay Rivers' considerable fee could hunt the dinosaur of his or her choice. But T Rex is a mere inconvenience compar... more »ed to this group of Homo sapiens.« less