by dimedrl
Easiest way I've found to solve this issue is to buy some ¼-inch color coding labels like these:http://smile.amazon.com/gp/product/B00007LVEX/ref=ox_sc_act_...
in two colors and place one color set of labels on top of the copyright info at the bottom of the 2012 set and the other color set on top of the copyright info at the bottom of the 2013 set. Makes sorting SO much faster.