Harold B. Mattingly Books

The Athenian Empire Restored

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One of the most important periods of Greek history lies between the Persian king Xerxes' defeat at Greek hands in 479 B.C.E. and the destruction of the power of Athens in 404 B.C.E. A major problem...

From Coins to History

By Harold B. Mattingly

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Coins of the Roman Empire in the British Museum.

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Roman Imperial Civilization

By Harold B. Mattingly

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Man in the Roman Street

By Harold B. Mattingly

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Christianity in the Roman Empire

By Harold B. Mattingly

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Man in the Roman Street

By Harold B. Mattingly

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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.