I am also recommending you spend some time watching the ebay auctions. Decide what you are looking for, set a price you are willing to pay, and wait. Go to car shows and check out the literature vendors. Some of the good buys are there.
I have picked up the factory turbo training pamphlets, the small and large dealer brochures, the post cards, a worn and a nice owners manual, the service manual, the body manual, the product selling information binder, the color, trim&selling manual, the advance sealer album, the dealership time guides, the stack of interior trim and fabrics, and somewhere I have the sheet with the paint chips.
There is a ton of information to be found with some patience and a little effort. I have copies of ads found at flea markets, magazines with road tests that I received and found.
Compile all the information you can and living with one of these older turbo cars gets a lot easier.