I bought this the other day

A nice little book of sketches and roughs by the man himself, Frank Frazetta. It's a small sized little sketchbook-type thing with loads of lovely loose drawings, color roughs, scribbles and coffee mug rings. Other than an introduction, there's not much in it text-wise, but as an artist it gave me some nice insights in the way Frank works/worked:
Frank Frazetta - Rough Work