Subspace Design Logs - Theoretical Propulsion was an official record of the design of the subspace warp field propulsion system for the Galaxy-class starships by the Theoretical Propulsion Group. A copy of these logs was stored in the Subspace Warp Field Overview, a folder in the Engineering Systems Database, aboard the USS Enterprise-D in 2366. (TNG: "Booby Trap", okudagram)

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