There are two locations in Vivec - Hlaalu Records and Redoran Records - that are supposed to keep records for their respective Houses. If you actually look at the record books, they are all in-game books - dozens and dozens of them. Especially if you have some book jacket mod (like Better Books - and why shouldn't you?) this is immersion breaking.

So for those two cells, I replaced almost all the game books with five or so different version of generic record books for each house. Reading them gives you something like:

[These are official records, ledgers, and documents for House Hlaalu. And of absolutely no use to you.]

or

[These are official records and documents for House Redoran. Dusty, dull, and useless to you.]

No quests use the replaced books, and there were no skill books in either cell, so it should have no impact on gameplay. I created this mod originally for incorporation in MTA_version4 for Midgetalien, so don't use this if using that mod. Otherwise I don't think there will be any mod conflicts.

That's it - no new quests or changes to anything besides the books in those two cells. The only point to the changes are to make things a little more lore friendly and immersive.

It's on Morrowind Nexus now: http://www.nexusmods.com/morrowind/mods/43033/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fmorrowind%2Fajax%2Fmoddescription%2F%3Fid%3D43033%26preview%3D&pUp=1