TSR, Inc., formerly known as Tactical Studies Rules, was the publisher of Dragon magazine, Sterling Hershey's 1992 "Defection" RPGA scenario, the Star Wars: Warriors of the Republic campaign, as well as five issues of the UK-published Polyhedron magazine, later co-published by Wizards of the Coast[3] as a result of Wizards aquisition of the RPGA through their purchase of TSR, Inc. in June, 1997.[4]

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