Earth Factor X
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Overview:
- Title: Earth Factor X
- Author: A. E. van Vogt
- Year: 1978
- ISBN-10: 0879974125
- Publisher: DAW Books
- Price: $1.50
- Pages: 174
- Binding: Paperback
- Type: Novel
- Title Reference: Earth Factor X
- Notes:
- "First DAW printing August 1976"
- Third printing by number line 3—9.
- Publication date from Locus #216 (November 1978)
- "Cover art by Greg Theakston" on the copyright page; the artwork is also signed
- Interior art piece is not credited, has Gaughan's "JG" on it, same piece as the 1976 edition
- DAW catalog #UW1412, full ISBN on spine only
- The copyright and title pages have the note "Original title: The Secret Galactics."
- Printed in the US