W. Jeffrey Tatum Books

The patrician tribune

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Publius Clodius Pulcher was a prominent political figure during the last years of the Roman Republic. The first modern, comprehensive biography of Clodius, The Patrician Tribune traces his career f...

Always I am Caesar

By W. Jeffrey Tatum

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Always I Am Caesar

By W. Jeffrey Tatum

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Noble Ruin

By W. Jeffrey Tatum

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Quintus Cicero

By W. Jeffrey Tatum

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Always I Am Caesar

By W. Jeffrey Tatum

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Always I Am Caesar

By W. Jeffrey Tatum

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Patrician Tribune

By W. Jeffrey Tatum

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A Caesar reader

By Gaius Julius Caesar

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Patrician Tribune

By W. Jeffrey Tatum

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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.