Instructions:Voucher code is valid for an unlimited use voucher for 35% off select eBook purchases from this page and on select lists. Discount will be confirmed at checkout. Offer valid from December 19, 2014 at 12:00 AM EST through December 22, 2014 at 11:59 PM EST. This offer is not valid in conjunction with any other offer or promotion and cannot be used to adjust amount paid on previous purchases. Voucher code must be entered at time of purchase to qualify for this discount. Discounts cannot be applied nor the discount value refunded once a purchase is complete. We reserve the right to change or end this offer at any time without notice.