Harold Holzer Books

The living Lincoln

By Harold Holzer, Williams Frank J., Thomas A. Horrocks

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1863

By Harold Holzer, Sara Vaughn Gabbard

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"Only hours into the new year of 1863, Abraham Lincoln performed perhaps his most famous action as president by signing the Emancipation Proclamation.... Several defining moments of Lincoln's presi...

1865

By Harold Holzer, Sara Vaughn Gabbard

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1865

By Harold Holzer, Sara Vaughn Gabbard

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The living Lincoln

By Harold Holzer, Williams Frank J., Thomas A. Horrocks

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Confederate image

By Mark E. Neely

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The Lincoln Mailbag

By Harold Holzer

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The Lincoln Mailbag

By Harold Holzer

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Dear Mr. Lincoln

By Harold Holzer

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The Union image

By Mark E. Neely

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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.