I have a Miscellaneous Quest with the objective "Find the copy of the Wild Elves". The map marker informs me that it is located in Mara's Eye Pond, which I visited and retrieved the book The Wild Elves, but the quest still informs me to find it at that location.
I have researched the book, and there is no information on the page about it being in Mara's Eye Pond. I have researched miscellaneous quests for skyrim, but no mention of this quest. I have also researched quest items, but this book is not listed as one. I can't diddly-squat on this.
Just checked with Urag and there was no option to complete the quest. This does sound familiar, though. I asked what special books he wants, I guess I'll keep doing that until he asks for The Wild Elves? I have no options left.... gah
If you have the book before the quest it will probably cause a bug (its listed on the bugs list on the quest page i linked above or here). I have two copys of the book The Legendary Scourge stuck in my inventory with my latest playthough becuse of it.
If your on a PC use the console command TCL to get though the gate. If your on a PS3 or XBox try the plate glitch, hold a silver plate against a flate surface and use Whirlwind Sprint (google "Skyrim plate glitch" it for a better explanation).