The Other Sky / The House in November

From Author Wars - https://authorwars.com/publications/the-other-sky--the-house-in-november-44954.html

Overview:

Title: The Other Sky / The House in November
Author: Keith Laumer
Year: 1985
ISBN-10: 0812543777
Publisher: Tor
Price: $2.95
Pages: 79+170
Binding: dos
Type: Omnibus
Title Reference: The House in November
Notes:
A dos-a-dos book with two covers and two copyright pages. Stated second Tor printing. Canadian ISBN 0-812-54378-5. Canadian price $3.50 "Tor Double" on the cover, but, unlike other books in the Tor Double publication series, this one is not numbered. https://en.wikipedia.org/wiki/Tor_Double_Novels claims that officially it was not a Tor Double. The two covers were done by two different artists, Tom Kidd and Mike Embden. Kidd's cover is for "The Other Sky" while Embden's cover is for "The House in November". However, the two copyright pages incorrectly attribute Kidd's cover to Embden and vice versa.