Back in the late 1980's, David Christensen (who was a consultant to Paramount studios during ST:TNG) and Cathy Doser put together an impressive manual based solely on the Klingon empire. The Klingon Covert Operations Manual This 128-page manual is now available online for the first time. You can access it via the following link: https://www.cygnus-x1.net/links/lcars/klingon-covert-ops-manual.php Enjoy-
Large amounts of it are obviously from FASA - including the Fleet Recognition Guides, and the Klingon supplements...