This is a book about genealogies by Sheikh Hamad Al-Jasser, may God have mercy on him. It talks about families in Najd, titled "Civilized Families in Najd". The book is in two parts and is considered one of the best books that discussed the tribes in the Najd region in a scientific and organized manner alphabetically from A to B. This book is rare and not found in libraries except rarely and in a summarized version, not two volumes.