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*Offer Terms & Conditions: Offer expires on July 25, 2019 at 11:59PM PDT. Offer applies only to products in the Back to School Sale, Workbooks, Reference, and Value Packs shops. Promo code BTS2019 must be entered at checkout. Promotion cannot be combined with any other offers. Promotions, discounts and gift codes apply to the order subtotal, before any taxes, shipping, handling or other fees.