Call-A.P.P.L.E.'s "All About Applesoft", original vs. "Enhanced Edition"

Just wondering if any knows if the "Enhanced Edition" of Call-A.P.P.L.E.'s book "All About Applesoft" available at lulu.com adds any additional material over the original edition from the early '80s?  The page count on the "enhanced edition"  is considerably greater than the original, but was unsure if the difference comes from new formatting/layout or if it's from actual added material.