cleaning the garage...found i still have this though the car has been long gone...

Audi 100, 200 Official Factory Repair Manual
complete 3 volume set in very good/excellent condition.

Covers 1989, 1990, 1991 Audi 100, 100 quattro, 200, 200 quattro, including avants and turbos
yes, this covers the 20v 3B engine, along with the MC (-1 and -2), and the normally aspirated NF engine.

$95 shipped in the continental US