Please check your order carefully before affixing school stamps or labels. If there is a problem with your order, please contact our customer service department at 888-518-8004 within 30 days of receipt of shipment. To ensure proper credit, do not return any materials until you have received authorization to do so. Book stores should take note that any returns must be made within 90 days of the invoice date and must be in saleable condition. Book returns from bookstores will recieve store credit only. Please call for other return conditions.