PRIOR AUTHORIZATION MUST BE OBTAINED FOR ALL PERMITTED RETURNS. ALL RETURNS ARE GOVERNED BY HMH’S STANDARD TERMS AND CONDITIONS (see Section 6 “CUSTOMER RETURNS” under Standard Terms and Conditions). HMH cannot guarantee credit for an unauthorized return. Please contact Customer Service for authorization and reference your invoice number. If the original order is not returned in its entirety (i.e. the customer returns only a portion of the student books ordered) all free materials received with the original order must be returned in proportion to the number of returned student books. If free materials are not returned, the customer will be charged the value of the free materials, at the applicable for sale price, for those materials not returned. This amount will be deducted from the calculated value of the returned student books to arrive at the net credit due to the customer. Contact Customer Service to report incorrect titles or damaged or defective products. Please reference your invoice number on all inquiries. Materials may be returned within six months (or one month for home schools and individual purchasers) of the invoice date if in unmarked, unused, and salable condition. Stamped books are not returnable. Please direct written requests to Customer Service, at K12inquiries@hmhco.com, or call 800.225.5425 for instructions.