P1073 Translated and adapted from Vers la renaissance des inventions, part of a series entitled L'épopée des découvertes et des inventions. Paris : Sélection du Reader's Digest, 2005.
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The Middle Ages : 1000 to 1600. ISBN 9780276445156. Published by Reader's Digest Association in 2009. Publication and catalogue information, links to buy online and reader comments.