Yes, that link seems to be dead. It was active up to a few months ago.I recently came across a very early Orange Song Book - published about 1810. Given that the order was only founded about 1794, thiis was an interesting one. Its now in the Irish Traditioinal Music Archive - which rightly believes that what we have is ONE tradition - albeit a rather confused one!
Regards
p.s. Bruce O. Have you any record of Orange books of this period?