William F. Mann Books

The Knights Templar in the New World

By William F. Mann

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The Templar Meridians

By William F. Mann

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Templar sanctuaries in North America

By William F. Mann

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"Traces the movement of the Templars' secret treasure across North America to where it still resides, protected by a sacred lineage of guardians; explains how the Templars found refuge with Native...

Knights Templar in the New World

By William F. Mann

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Templar Meridians

By William F. Mann

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Last Refuge of the Knights Templar

By William F. Mann

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Last Refuge of the Knights Templar

By William F. Mann

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Templar Sanctuaries in North America

By William F. Mann, Scott F. Wolter

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The labyrinth of the Grail

By William F. Mann

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.