Each week the NYTBR receives 750 to 1000 books from authors and publishers in the mail, of which 20 to 30 are chosen for review.[1] Books are selected by the "preview editors" who read over 1,500 advance galleys a year.[3] The selection process is based on finding books that are important and notable, as well as discovering new authors whose books stand above the crowd.[1] Self-published books are generally not reviewed as a matter of policy.[1] Books not selected for review are stored in a "discard room" and then sold.[1] As of 2006[update], Barnes & Noble arrived about once a month to purchase the contents of the discard room, and the proceeds are then donated by NYTBR to charities.[1] Books that are actually reviewed are usually donated to the reviewer.[1]