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HeinOnline is a subscription research database offering access to legal periodicals, government documents, constitutions, historical materials, and other scholarly collections. Its resources cover law alongside subjects such as business, economics, human rights, public policy, and international relations. Users can search across collections, narrow results with subject and library filters, and consult digitized publications and primary materials. HeinOnline serves academic institutions, law firms, government agencies, libraries, and other research organizations. The platform’s collection mix depends on the subscribing institution’s access, and its help center provides guidance on searching and navigating available databases.