 Numbers designating where the covers originated were printed near the RIAA symbol on the back; for example, stereo copies from the Los Angeles plant were designated "5" and mono Los Angeles copies were marked "6".Mono copies outnumbered stereo copies by about ten to one, making the stereo copies far more rare and valuable to collectors.Capitol initially ordered plant managers to destroy the covers, and the Jacksonville plant delivered most of its copies to a landfill.