skos:altLabel | - Houghton
- Rigby
- Harcourt
- Graphia
- American Heritage Guide
- Clarion Books
- Curious World
- H. O. Houghton and Company
- HMH
- HMH Books
- HMH Books for Young Readers
- HMH Productions
- Houghton Mifflin
- Houghton Mifflin Books
- Houghton Mifflin Books for Children
- Houghton Mifflin Co
- Houghton Mifflin Co.
- Houghton Mifflin Company
- Houghton Mifflin Company.
- Houghton Mifflin Harcourt Publishing
- Houghton Mifflin Harcourt Publishing Company
- Houghton Mifflin Harcourt's
- Houghton Mifflin Riverdeep Group
- Houghton Mifflin and Co
- Houghton Mifflin and Company
- Houghton Mifflin's
- Houghton Miifflin
- Houghton and Mifflin
- Houghton, Mifflin
- Houghton, Mifflin & Co
- Houghton, Mifflin & Co.
- Houghton, Mifflin & Company
- Houghton, Mifflin and Co.
- Houghton, Mifflin and Company
- Houghton, Mifflin, & Co.
- Houghton, Mifflin, and Company
- Houghton, Osgood and Company
- Houghton-Mifflin
- Houghton-Mifflin Harcourt
- John Joseph Adams Books
- NASDAQ:HMHC
- Rigby Publishers
- Riverside Press
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