What is "bookracks"

Usage examples of "bookracks".

Not one of those mindless, looney-bin rejects who line the bookracks: The Exterminator, The Extincter, The Ripper, The Slasher, The Wiper-Outer, The Mutilator, The Ix-Nayer, all those same series, with their same covers, their same plots, and their same moronic machine-gunning leads who figure the best way to solve a problem is to shoot it.

I gulped down another for luck, then slumped on the green-and-mauve, closed my eyes, and lulled myself with a pleasant reverie of books, bookracks, temperate bookbuyers, invoices, and quarterly tax estimates as yet uncomputed.