Months of rumors ended a few weeks ago when it was confirmed that the Houghton Mifflin Riverdeep Group purchased the school divisions and Trade division of Harcourt for $4 billion. Harcourt Education includes the pre-K–grade 6 publisher Harcourt School Publishers; Holt, Rinehart and Winston, publisher for grades 6–12; the supplementary publisher Harcourt Achieve; and the library reference publisher Greenwood-Heinemann.