"originals"
if you got it back in the days the original book itself is probably one of your best investments/trades.
http://www.amazon.com/gp/offer-listing/B00O6EDSFA/ref=sr_1_1_twi_1_har_olp?ie=UTF8&qid=1427818778&sr=8-1&keywords=beat+the+market+thorp