Csound Catalog vs Csound Book

Hi folks,

Is there content in the Csound Catalog CDs that is not also on the Csound Book CDs? I've got the Csound Book already, and am wondering if the Catalog would be a worthwhile investment.

BTW I thought I'd already posted this, but I don't see it in the forums. Sorry if it shows up twice.

Thanks,

-- JK