Acknowledgment is made for permission to print the following material:
"A Gun for Dinosaur" by L. Sprague de Camp. Copyright © 1956 by Galaxy Publishing Corporation. First published in Galaxy Science Fiction. March 1956. Reprinted by permission of the author.
"Poor Little Warrior" by Brian W. Aldiss. Copyright © 1958 by Fantasy House. Inc. Reprinted by permission of the author.
"Green Brother" by Howard Waldrop. Copyright © 1982 by Flight Unlimited, Inc. First published in Shayol #5, winter 1982. Reprinted by permission of the author.
"Hatching Season" by Harry Turtledove. Copyright © 1985 by Davis Publications, Inc. First published in Analog, December 1985. Reprinted by permission of the author.
"Getting Away" by Steven Utley. Copyright © 1976 by UPD Publishing Corporation. First published in Galaxy Science Fiction, 1976. Reprinted by permission of the author.
"The Runners" by Bob Buckley. Copyright © 1978 by Davis Publications, Inc. First published in Analog, April 1978. Reprinted by permission of the author.
"The Last Thunder Horse West of the Mississippi" by Sharon N. Farber. Copyright © 1988 by Davis Publications, Inc. First published in Isaac Asimov's Science Fiction Magazine, November 1988. Reprinted by permission of the author.
"Strata" by Edward Bryant. Copyright © 1980 by Mercury Press, Inc. First published in The Magazine of Fantasy and Science Fiction, August 1980. Reprinted by permission of the author.
"Times Arrow" by Arthur C. Clarke. Copyright © 1952 by Hillman Periodicals, Inc. First published in Worlds Beyond. Reprinted by permission of the author.
A Change in the Weather" by Jack Dann and Gardner Dozois. Copyright © 1981 by Playboy. First published in Playboy, June 1981. Reprinted by permission of the authors.
The Night-Blooming Saurian" by James Tiptree, Jr. Copyright © 1970 by Universal Publishing and Distributing Corporation. First published in Worlds Of If, May-June 1970. Reprinted by permission of the author's agent, Virginia Kidd.
Dinosaur" by Steve Rasnic Tern. Copyright © 1987 by Davis Publications, Inc. First published in Isaac Asimov's Science Fiction Magazine, May 1987. Reprinted by permission of the author.
"Dinosaurs" by Geoffrey A. Landis. Copyright © 1985 by Geoffrey A. Landis. -st published in Analog, June 1985. Reprinted by permission of the author.
"Dinosaur on a Bicycle" by Tim Sullivan. Copyright © 1987 by Davis Publications, Inc. First published in Isaac Asimov's Science Fiction Magazine, March 1987. Reprinted by permission of the author.