While this is indeed the index of worlds and the maps... without the UWP's, it's a bit of a waste. The world UWPs are on TravellerMap, so they're available, but the original modules (which I've had since 1984) have not just the world listings and subsector paragraphs, but sector specific encounter tables and some additional materials. Further, note that these 4 sectors have been removed from Traveller Canon... done explicitly in Atlas of the Imperium. For 0 dollars? Meh. Better versions available online legit and free.