A centralized online archive of thousands of digitized medieval manuscripts from around the world. Use the search box to quickly search on specific terms, or use the "Search Manuscripts" link to search on particular fields, such as date, or provenance information.
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Here you will find William Caxton's two editions of Chaucer's Canterbury Tales, probably printed in 1476 and 1483. The originals are both in the British Library. The site also includes a brief history of the texts and tips for comparison.