Harold Holzer Books

The Union Preserved: A Guide to Civil War Records in the New York State Archives is a lavishly illustrated, comprehensive reference work that makes available to a wide public one of the most import...

Prang's Civil War Pictures

By Louis Prang, Harold Holzer

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"During the 1880s - the peak years of the first wave of sentimental recollection of the American Civil War - a German-born, Boston-based picture publisher successfully commissioned the most ambitio...

State of the Union

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.