Supporting volumes have been issued, including "The American Heritage Book of English Usage", "The American Heritage Dictionary of Indo-European Roots", "The American Heritage Abbreviations Dictionary", "The American Heritage Dictionary of Idioms", "The American Heritage Thesaurus" in various sizes; usage dictionaries of special vocabulary such as "The American Heritage Science Dictionary", "The American Heritage Medical Dictionary" and "The American Heritage Dictionary of Business Terms"; plus special dictionary editions for children, high-school students, and English-language learners. The "American Heritage" brand is also used for a series of American history books.