In several cases, entries in this anthology are written with an essay portion first, followed by a short story. When that short story is substantive in its right, generally at least half of the entry, then that entry is listed as a short-story. Otherwise, or when there is no such story, the entry is listed as an essay.
- Alternate History: Mostly essays with some short stories.
- "1 3 5 7 9 10 8 6 4 2" on copyright page.
- Cover design credited on back flap of dustjacket.
- Interior art consists of maps (Jeffrey L. Ward) and various photographs.
- {{OCLC|733751321}} and {{OCLC|768646937}} list the book as "What If?"'; the other 2 records list the complete name.
