There is no such book. You already have the best, just go at it S-L-OW-L-Y. (no one can play as fast as Earl for at least 5-6 years after they have started). the excercises lead to the first tune that you learn in the book, " Cripple Creek" everyone knows how it sounds and it has most of the elements,( roll,s hammer ons ,pull offs etc) and all of those "involved" things that go to make up Scruggs 5 string banjo style.
Buy and use a mute or you'll drive your family mad :-)>