George RR Martin's Dance of Dragons has been published in two volumes as a paperback - having been a single hardback - in the same way Storm of Swords was. Amazon users don't understand this.

http://www.amazon.co.uk/product-reviews/0007466072/ref=wl_it_o_cm_cr_acr_pop_hist_1?ie=UTF8&coliid=I26UUXMCWN4GBM&showViewpoints=0&filterBy=addOneStar&colid=24TJ4EZSPZHND