HMHC - Houghton Mifflin Harcourt Co (HMHC) Q3 2021 Earnings Call Transcript November, 04 2021 07:32 PM Houghton Mifflin Harcourt Company Image source: The Motley Fool. Houghton Mifflin Harcourt Co (NASDAQ: HMHC) Q3 2021 Earnings Call Nov 4, 2021 , 9:30 a.m. ET Operator Continue reading For further details see: Houghton Mifflin Harcourt Co (HMHC) Q3 2021 Earnings Call Transcript