The Heir of Slytherin is one of several Dark Magic books in the Minister for Magic’s office. It is a book about Lord Voldemort (CC1.19).
Minister Hermione Granger kept this book in the booby-trapped bookcase (CC1.19).
Lexicon's timeline of Lord Voldemort
Lexicon list of Biographical books
From the Web
Writing by J K Rowling on WizardingWorld.com (Pottermore): Ministers for Magic
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