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Any questions regarding Houghton Mifflin Harcourt products, or queries concerning existing orders, can be addressed to our Customer Service department.
Customer Service website: http://customercare.hmhco.com
Email: TradeCustomerService@hmhpub.com
Phone: (800) 225-3362
Fax: (800) 634-7568
The Customer Service mailing address is:
Houghton Mifflin Harcourt Trade & Reference Customer Service
9205 Southpark Center Loop
3rd Floor
Orlando, FL 32819