Houghton Mifflin Harcourt is an annual sponsor of the Refuge Photography Contest. Fourth prize and honorable mention winners of the 2009 Refuge Photo Contest were awarded Linda Lear's biography "Rachel Carson: Witness for Nature," generously donated by Houghton Mifflin Harcourt.

Field Guides published by Houghton Mifflin Harcourt have set the high standards for guides that are informative, practical, thorough, and easy to use.