sentences: "(1990), "Dinosaurs" (1996), "" (1997), "The SFWA Grand Masters, Volume 1" (1999), "The World Turned Upside Down" (2005), and "The Best Time Travel Stories of the 20th Century" (2005), as well as such collections of de Camp's work as "A Gun for Dinosaur and Other Imaginative Tales" (1963), "The Best of L. Sprague de Camp" (1978), "Rivers of Time" (1993), and "" (2005).