sentences:  Despite the fact that many of Ibn Babawayh's other works are extremely important, this book is probably the most famous of his extant writings.However, some authorities maintain that there were five major books of traditions that included another of Ibn Babawayh's works, "Madinat al-'ilm".Al-Tusi mentions that the latter work was bigger than "Man la yahduruhu al-faqih" but may no longer exist.