[Coco] Coco3 ASM programming book

[David]

...speaking of assembly books (ok, so not really, but what other intro 
works apart from 'hi again' :) )

Does anyone have, or know of, any books regarding assembly programming 
specifically for the Coco3?

I've got Barden's Coco ASM book (62-2077) but it's Coco2 based, and even 
then doesn't go too deep in various topics I'm interested in

Anyone got the sequel, or the Graphics book he plugs?

Willing to pay reasonably prices for any of the above :)

Regards,
David