Allen C. Guelzo Books

The Lincoln Enigma: The Changing Faces of an American Icon

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Nearly a century and a half after his death, Abraham Lincoln remains an intrinsic part of the American consciousness, yet his intentions as president and his personal character continue to stir deb...

Gettysburg: The Last Invasion

By Allen C. Guelzo

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From the acclaimed Civil War historian, a brilliant new history--the most intimate and richly readable account we have had--of the climactic three-day battle of Gettysburg (July 1-3, 1863), which d...

The crisis of the American republic

By Allen C. Guelzo

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Lincoln s Devotional The Writings That Inspired Lincoln s Personal Spiritual Life

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The New England Theology

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Many recognize the importance of Jonathan Edwards, yet the writings of those who followed in his theological footsteps are less widely known. This collection draws together their key works, making...

Edwards in Our Time

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Lincoln s America 1809 1865

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The Teaching Company History of the United States 2nd Edition Complete Set The Great Courses Modern History Course 8500

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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.