The Ringworld Engineers

From Author Wars - https://authorwars.com/publications/the-ringworld-engineers-46208.html

Overview:

Title: The Ringworld Engineers
Author: Larry Niven
Year: 1980
ISBN-10: 0030213762
Publisher: Holt, Rinehart and Winston
Price: $9.95
Pages: xi+357
Binding: Hardcover
Type: Novel
Title Reference: The Ringworld Engineers
Notes: 1st printing per number line. Publication date (0380) on front flap The map is uncredited, bit signed "Duane (after Niven & Wu)"