Donald Jeffries Books

Hidden History

By Donald Jeffries

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The Unreals

By Donald Jeffries

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Hidden history

By Donald Jeffries

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Examines what the author sees as "the amount of effort over the past fifty years that our government has dedicated to lying and covering up the truth to the world"--

Masking the Truth

By Donald Jeffries

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Masking the Truth

By Donald Jeffries

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Crimes and Cover Ups in American Politics

By Ron Paul, Donald Jeffries

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Crimes and Cover Ups in American Politics

By Ron Paul, Donald Jeffries

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Crimes and Cover Ups in American Politics

By Ron Paul, Donald Jeffries

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Survival of the Richest

By Donald Jeffries, Naomi Wolf

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American Memory Hole

By Donald Jeffries

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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.