Well, it seems Harbour's Unnofficial Guide officially went awry. I just
realized he is providing the book in PDF format through his web page
(http://www.jharbour.com/gameboy/) and selling the source code via PayPal.

I can only guess what were their licensing troubles with Nintendo...

Cheer up!


-- /"I have always found that Angels have the vanity to
PabloBleyerKocik/ speak of themselves as the only wise; this they do
pbleyer / with a confident insolence sprouting from systematic
@embedded.cl/ reasoning."-The Marriage of Heaven and Hell, W. Blake