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PhilPapers is a comprehensive index and bibliography of philosophy maintained by the community of philosophers. All sources are monitored for research content in philosophy, including journals, books, open access archives, and personal pages maintained by academics. PhilPapers also hosts the largest open access archive in philosophy. The index currently contains 2,481,360 entries categorized in 5,638 categories.
The Post-Reformation Digital Library (PRDL) is a select database of digital books relating to the development of theology and philosophy during the Reformation and Post-Reformation/Early Modern Era (late 15th-18th c.). Late medieval and patristic works printed and referenced in the early modern era are also included. The PRDL is a project of the Junius Institute for Digital Reformation Research.