Book bonuses?

By Rudd1ger, in Operation: Night Eagle

Apologies if there is information about this else where but I couldn't seem to find anything on it. Do these books contain bonuses for the Tannhauser game to send away for? Such as the Golum book containing an extra Android event card or the Arkham novels that contain additional stories for Elder Sign/Arkham Horror. I am curious as it will determine if I purchase this via ebook or physical copy.