Harold Holzer Books

An award-winning presidential historian offers an authoritative account of American presidents' attacks on our freedom of the press.“The FAKE NEWS media,” Donald Trump has tweeted, &ldq...

The Presidents vs. the Press

By Harold Holzer

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An award-winning presidential historian offers an authoritative account of American presidents' attacks on our freedom of the press—including a new foreword chronicling the end of the Trump p...

Monument Man

By Harold Holzer

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Lincoln As I Knew Him

By Harold Holzer

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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.