Ok.. you are looking for a place called "Silverwind Refuge" in Ashenvale. The exact coords are 49,67 but for those of you without coords you head east out of Astranaar keep going quite a ways till you come to a spot where you see a bench with a book on it to the left of the road... continue up the road a bit you see a path on the right that leads down to the furbolgs. Follow the darkened path until you come to Silverwind Refuge and look for the trades vendor .... GL

I always buy a couple of extra books while I'm there to sell at AH, that way it more than covers the cost of the trip. I'm happy to rip off those not willing to make the trip by charging 3-5g :-)