Kitab ad-Du'afah by Hafidh Abu Na'im al-Asbahani (430H)

Book of the great Hafidh Abu Na'im al-Asbahani (336-430H) in which he quotes in alphabetical order several dozens of narrators indicating their state and their degree, their type of defect or weakness.

Excellent verified edition, in which the Muhaqqiq put commentary annotations on the narrators to complete what Abu Na'im says with the words of other Muhaddith.

Harakat on words and names that can be confusing.