Lucifer's Hammer

From Author Wars - https://authorwars.com/publications/lucifers-hammer-269224.html

Overview:

Title: Lucifer's Hammer
Author: Larry Niven, Jerry Pournelle
Year: 1982
ISBN-10: 0708813623
Publisher: Orbit
Price: £2.50
Pages: 639
Binding: Paperback
Type: Novel
Title Reference: Lucifer's Hammer
Notes: Mentions prior printings in 1978 and 1980.
However, there were actually TWO printings in 1978 (according to the 1980 edition) so this would be fourth printing overall.
Cover art credit from signature PAJ on back cover. Australia $8.75