Someone with an interest in electronics might find this interesting.
It seems that the fellow who runs the following website enjoys collecting, and then digitizing, vintage printed things about electronics. Also, he accepts items that have been digitized by other people. On his site are hundreds, maybe thousands, of old electronics books, articles, catalogs, brochures, schematics, and the like.
http://www.pmillett.com/tubebooks/
Not interested in the old stuff, but enjoy building audio projects? He also has, on his homepage, links to instructions for about 50 of those.
http://www.pmillett.com/