The book you saw may have covered just one county - I have seen books like that for various Kentucky counties.

I do not know of any comprehensive listing for all Kentucky enlistees in the Civil War, but there were compiled lists put out by the Adjutant General's Office that listed Federals and Confederates in separate works (2 volumes for each). Here is a link to the Confederate reports on Amazon:
http://www.amazon.com/gp/offer-listing/B002RY5GPQ/ref=dp_olp_new?ie=UTF8&qid=1285268474&sr=8-15&condition=new

Steve Lynn compiled a more comprehensive listing of Kentucky Confederates, in alphabetical order (the AGR books above are listed by unit, but they do have name indices).
http://www.amazon.com/gp/offer-listing/0971907811/ref=dp_olp_new?ie=UTF8&qid=1285268619&sr=8-4&condition=new

Regards,

Geoff Walden