Invariant
From Author Wars - https://authorwars.com/books/invariant-848161.html
Editions/Publications:
- Unknown. The Best of Astounding (Unknown, Williams, Baronet Publishing Co., ISBN-10: 0894370243, $5.95, 244 pages, Trade Paperback, Anthology)
- Unknown. The Best of Astounding (Unknown, Williams, Ace Books, ISBN-10: 0441054722, $1.95, 244 pages, Paperback, Anthology)
- Unknown. Astounding Science Fiction, April 1944 (Unknown, Williams, Street & Smith Publications, Inc., $0.25, 180 pages, digest, MAGAZINE)
- Unknown. The Best of Astounding (Unknown, Williams, Baronet Publishing Co., ISBN-10: 0894370243, $5.95, 244 pages, Trade Paperback, Anthology)