I picked this book yesterday. It's called Hinterlands and it is a guide to the unofficial trails in the Red River Gorge area. It was just published in 2007.
It a really cool book that has details for about 114 unofficial, unmarked side trails. A lot of the trails are pretty short but they can offer new hanging spots and some solitude. Although the side trails may be short most require that you hike in some distance on official, marked trails to get to the unofficial trails. Some of the trails are really rugged and may require some land navigation skills and rock climbing skills. Cool
It's chocked full of info like elevation charts, driving directions to the trail, trail description, and GPS info including trail head, trail terminus, and any established campsites on these trails. Lots of nice b/w pics also.
Any one who is a fan of the RRG should get this book. Probably end up with some beautiful hanging spots.
Website for ordering:
Photo from some of the unofficial trails:
Picked up my copy in Lexington, Ky at J&H Outfitters. I'm sure Phillip Galls Outdoors or Joseph Beth Booksellers would also carry it for those in the Lexington area