May 21, 2015
Houghton Mifflin Harcourt signs on as official sponsor for Boston Celtics

Participating in this sponsorship deal:

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Houghton Mifflin encourages you to buy books from both online and local booksellers. For information about booksellers in your area, we recommend you visit Book Web’s Bookstore Directory or order from an online bookstore in the list provided.
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