So last night, Maub and I went to Strat and did a full clear of the living side. While there we found several books that are on the "Well Read" achievement. I think it was 7 or 8 books we found. We did not do a full clear on the dead side, so we might have missed some books there. Maub made the statement that we should schedule runs in all the instances where books may be found. I am sure there are several in Scarlet Monastery, as well. Also for those who are grinding rep with Argent Dawn, with my trinket on I collected almost 6k rep doing Strat and Scholomance. I am now almost revered with Argent Dawn thanks to Maub. We also collected like 26 Large Brilliant Shards. also quite a bit of Illusion Dust and Greater Eternal Essence.

I've read all but about 12 or so

several can be found in Strat and Scholomance as mentioned. there are also books in Scarlet Monastery's, *gasp*, library. there are also books to be found in major cities too. there are books in the keep of Stormwind as well as an oddly place book in the tavern on the right just as you enter the dwarf district. In Ironforge books are to be found in the explorers league. I found a book in the tower at sentinel hill in westfall too.

Basically they are scattered all over with some popping up in areas you don't expect.

If you look up achievements like this on www.wowhead.com you can usually find a few comment posts that will tell you all the locations you need.

I remember there being a few in dire maul too.

I usually flip through one in the Keep while I'm waiting to pvp.