Theta Borealis Sector

Theta Borealis Sector is a 1981 role-playing game supplement published by Group One for "Traveller".
Contents.
"Theta Borealis Sector" outlines the various worlds and subsectors that make up the Group One "Traveller" universe.
Reception.
William A. Barton reviewed "Theta Borealis Sector" in "The Space Gamer" No. 48. Barton commented that "While there's no great reason for most players to leave the sector in which they're currently adventuring for "Theta Borealis Sector" [...] the product is well-suited for those who'd prefer some distance between themselves and the Imperium. And it does show that Group One is working to improve its products."