No "small book" could possibly list all Kentucky men, Federal and Confederate, who served during the Civil War. Even if the print was as small as a phone book, it would have to be a hefty volume. Plus, such record would not be printed jointly (in one book). Federal soldiers would be listed in one volume, Confederates in another, like the soldiers from the State of Tennessee, and those are good-size books.

You may have saved yourself some money.