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Sickels, John. GURPS Federation. GURPS Prime Directive. Second Printing, updated for GURPS 4th Edition. Additional material by Steven P. Petrick, Al Beddow, Gary Plana, Hugh Bishop, James E. Goodrich, and Stephen V. Cole. Edited by Jean Sexton. Cover by Dennis Calero. Illustrations by Alvin Belflower, Dan Carroll, Ted Geibel, Loren Knight, Jim McGonigle, Dale McKee, and Adam Turner. Graphics by Adam Turner and Stephen V. Cole. Frigate deck plans by Nick Blank. GURPS System Design by Steve Jackson. GURPS Line Editor: Sean "Dr. Kromm" Punch. Project Staff: Gary Plana, Loren Knight, James E. Goodrich, Bob Gilson. Amarillo Design Bureau, Inc. 10 May 2011; revised 1 May 2020.