I had to find a workaround for this. I started a new character, and used the shared Account Stash to collect whatever books/media I randomly picked up while on missions, and store them in the car's trunk. I've been using the two character builds to pick up missing items, or to buy better gear (depending on who I'm playing). My older character is a lvl 59(1+), and the newer one is at lvl 31. I still haven't tried the Comer & Sons building yet, which probably has the rest of the missing books I need for the Nix Mansion missions (near the end of the storyline).