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Houghton Mifflin Harcourt represents the brands of Houghton Mifflin Harcourt School Publishers ? Holt McDougal ? Rigby ? Saxon ? Great Source ? Steck-Vaughn ? Houghton Mifflin Harcourt Learning Technology ? The Riverside Publishing Company ? Houghton Mifflin Harcourt International Publishers ? Houghton Mifflin Harcourt Trade and Reference Publishers ? Greenwood-Heinemann