Hate to burst your bubble, but there`s just about nobody left doing any work on the old Bimmers....those manuals would only have any value to someone who does restoration work, so you`re playing to a really small audience. I would put them on fleabay if I were you, you`ll have the most potential there.
The road goes ever onward....
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When faced with choosing between two evils, always go with the one you`ve never tried before....