I've found two houses on Asuka that have rune books that seem to go with the numbering system on this map. Both are near the road running west from Umbra to Hanse's Hostel.
The first house you'll encounter is right on the road, on the north side of it. The house name is "+Rune Station+ Asuka" and coordinates are 28o 40'N 33o 36'E. The house sign is hard to see because there's a lot of stuff "hanging" on it. It has some vendors on the east side of the house selling repair deeds and BODs.
The second house is further down the road. If you get to the brigand spawn that's a bit east of the orc fort, you've gone too far. If you hit the caves before Hanse's Hostel, you've definitely gone too far. Look for a house that says "T2" on the roof and right next to it a house that says "KGB" on the roof. Go past the house that says "KGB," make a sharp right and run more or less straight north to the fourth row of houses. You'll come to a large vendor shop called "Mio Shop," which also happens to be the name you'll see on the majority of the vendors. Coordinates are 34o 17'N 25o 44'E.
The first house right on the road has seemed deserted when I've gone by it; however, the Mio Shop vendors seem well-stocked, so chances are you probably could catch someone at that shop sometime during the day and perhaps ask them about the t-map books near the back of the store. Both houses have what looks like full Trammel and Fel sets of books.
If you want to meet up with me on Asuka and have me take you to the shops, just send me a PM. I'm not sure how much good it does to see their books, but I'll be happy to help if anyone's interested.