Engines

From Author Wars - https://authorwars.com/publications/engines-255823.html

Overview:

Title: Engines
Author: L. Sprague de Camp
Year: 1969
Publisher: Golden Press
Price: $0.75
Pages: 78
Binding: Paperback
Type: Non-fiction
Title Reference: Engines
Notes: No printing or edition stated. Third edition. {{LCCN|61-17048}}. There is a 2-page unnumbered index at the end of the book (the 1st page is illustrated) followed by an unnumbered page advertising other Golden Paperbacks.