scholars, particularly in terms of their contributions to social history and archaeology. The book discusses how these records, filled with personal accounts, financial transactions, and societal details, provide invaluable insights into the daily lives of families in past societies. Guibert emphasizes that these books contain not only financial records but also reflections on social relationships, domestic life, and local history, highlighting their comprehensive nature. Through detailed examples from various manuscripts, he illustrates how these sources can shed light on broader historical contexts, including economic practices, social structures, and cultural norms. Overall, Guibert advocates for the recognition and study of "livres de raison" as essential tools for understanding past human experiences and societal dynamics. (This is an automatically generated summary.)