Econ 2102/2103,同本书,update edition,跟study guide一起,$65.
Econ 4706, fourth edition,(最新), 跟新书没什么两样。(sold!!!)
Math 2007, 5e, 跟第6版没什么差别,书非常之新(今年年初买的),连sutdy guide $80.
Math 1005/2004/2008/2009, 4门用同本书,5e,同样非常新,连study guide $65.
Econ 4301, Industrial Organization, third...