Theory of Optimal Search

30 day return guarantee, with full refund including original shipping costs for up to 30 days after delivery if an item arrives misdescribed or damaged. Trade discounts only on items not identified on inventory with special discountsInternational customers are responsible for all Duties/Taxes/VATs/etc. For domestic orders, anything valued $300 or more will be shipped signature required. Returns/Refunds will be handled per Biblio's return policy. Please contact me directly, via email, before sending anything back so that we can make the necessary arrangements. Refunds occur when the book is received and the errors/issues/damages have been confirmed.