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Abu'l Qasim al-Zahrawi's 11th century medical encyclopedia: Kitab al-Tasrif.
The Kitab at-Tasrif (Arabic: كتاب التصريف لمن عجز عن التأليف) (The Method of Medicine) was an Arabic encyclopedia on medicine and surgery, written near the year 1000 by Abu al-Qasim al-Zahrawi (Abulcasis). It is available in translation.
One of Al-Zahrawi’s greatest contributions was the Kitab Al-Tasrif, a 30-volume encyclopedia of medical information. The Kitab al-Tasrif took Al-Zahrawi over 50 years to complete. It contains information about a wide variety of illnesses, injuries, medical conditions, treatments, and surgical procedures. He even describes over 200 different surgical instruments. It is said that almost 90% of surgical instruments being used today were demonstrated by Abulcasis. Surgeons continued to use the information in the Kitab al-Tasrif well into the 1700s. In fact, some of Al-Zahrawi’s surgical procedures are still being used to this very day. This book was included in the course studies of some of the biggest universities in Europe till the late 1800s.