Invariant
From Author Wars - https://authorwars.com/books/invariant-848160.html
Editions/Publications:
- Unknown. The Best of Astounding (Unknown, Willams, Baronet Publishing Co., ISBN-10: 0894370243, $5.95, 244 pages, Trade Paperback, Anthology)
- Unknown. The Best of Astounding (Unknown, Willams, Ace Books, ISBN-10: 0441054722, $1.95, 244 pages, Paperback, Anthology)
- Unknown. The Best of Astounding (Unknown, Willams, Baronet Publishing Co., ISBN-10: 0894370243, $5.95, 244 pages, Trade Paperback, Anthology)