The book you point includes the revised VGA versions of the articles. Some mentions of the differences between EGA and the VGA superset of same are included but the focus is not on EGA.
...currently reading those EGA articles...must search for external help, because unknown stuff with unknown words...pretty heavy. But I think I'll get help soon. I have already spoke to someone how knows about programming, but I don't know yet how good his knowlegde is.
I don't know how they did these things, but especially the atari-st stuff is really nice. only 16 colors out of 512 and no hardwarescrolling,
but stutterfree software softscolling, very impressive.
I did not see anything like that on EGA, even on VGA there no such things.