The first four pages of this book can be found on enemies scattered across Angmar, Eregion, and Moria. The last four pages of this book can be found on enemies scattered across Forochel, Moria, and the Misty Mountains.

The Book of Oaths discusses the central role of Honour in true leadership and the sanctity of a King's Oath -- or a Captain's. Much of the power to guide men truly derives from the simple bond of Truth itself, and for those who lead, an Oath is a bond of commitment that cannot be broken without inviting a fate most dire. Indeed, a captain who would betray his own word risks more than his life, for it is well-known that an Oath fatefully taken binds far more than the flesh.

This book is said to be the utmost authority in such matters, but the copy you have found seems badly damaged and many important passages are missing. Perhaps Boromir of Gondor, who currently rides here in the north, may know something about this book.