i noticed that too...
i remember when the book first came out i was like wtf song is THAT from??..like it says barbershop a bunch of times..
n then fischscale came out a while later...it took me a few looks back at the Manual to put it together tho..
seein that i get the feeling that some of the stuff we hear from Wu members might be them pullin shit outta rhyme books that were written a long time ago........ive heard in a few diff places that they have so many lyics that never been heard before ...plus i remember hearin Masta Killa spittin the Triumph verse on a freestyle from like 93...
just a thought