The Divine comedy
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English historical documents
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A Florentine Diary From 1450 to 1516
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The Praise of Folly
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Institutes of the Christian religion
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The Catechism of the Council of Trent
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The spiritual exercises of St. Ignatius
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Utopia
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The complete works of Friedrich Nietzsche.
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Manifesto of the Communist Party by Karl Marx and Frederick Engels ; authorized English translation ; edited and annotated by Frederick Engels
In the past twenty years, there have been a number of projects where books have been digitized and made available through online archive databases. The book archives/databases below can be searched by subject, title and author. Theses book databases make many more books available to the researcher, and also many primary source books/documents.