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Message * Articles On 13th Century In Science, including Roger Bacon, Pseudo-geber, Witelo, Zakariya Al-qazwini, Ibn Al-nafis, Pierre De Maricourt, Gregory Choniades, Al-dakhwar, Rashidun Al-suri, Liber Abaci, Silver Nitrate, Corpuscularianism - 1244693669 - 9781244693661