The 1957 Avon paperback (as Space Plague) is an abridgment of the 1956 Gnome Press first edition. The Lancer paperback reprint under the restored title is unabridged.
- The title is stated as Space Plague on the front cover and spine and as The Space Plague on the title page.
- The front cover and title page state "revised." The copyright page states "Copyright, ©, 1956 by George O. Smith. Highways in Hiding is based upon material originally copyrighted by Greenleaf Publishing Co., 1955. Published by arrangement with the Gnome Press, Inc. Printed in U.S.A."
- Printing date and printing number not stated. The source of the printing date is Tuck. Currey concurs.
- The artist is not credited, no visible signature
- Cover credit from THE ART OF RICHARD POWERS by Jane Frank.
