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Visit the Tech Online Support Center or contact us below: Hours of Operation: Sunday: 12:00 PM to 12:00 AM EST Monday-Thursday: 24 hours Friday: 12:00 AM to 9:00 PM EST Saturday: 10:00 AM to 8:00 PM EST Phone: (800) 331-5094 Online: Submit a Support Request Chat: Chat with a Representative
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Visit the Customer Service Online Support Center or contact us below: Hours of Operation: Monday-Friday: 8:00 AM to 6:00 PM ET Phone: (800) 338-3987 Fax: (800) 953-8691 By Mail: McGraw Hill P.O. Box 182605 Columbus, OH 43218