Paul C. Gutjahr Books

Popular American Literature of the 19th Century

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The Book of Mormon

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Late one night in 1823 Joseph Smith, Jr., was reportedly visited in his family's farmhouse in upstate New York by an angel named Moroni. According to Smith, Moroni told him of a buried stack of gol...

An American Bible

By Paul C. Gutjahr

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This book examines how many different constituencies (both secular and religious) fought to keep the Bible the preeminent text in the United States as the country's print marketplace experienced ex...

An American Bible

By Paul Gutjahr

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An American Bible

By Paul C. Gutjahr

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Illuminating Letters

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Charles Hodge: Guardian of American Orthodoxy

By Paul C. Gutjahr

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Charles Hodge: Guardian of American Orthodoxy

By Paul C. Gutjahr

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Charles Hodge

By Paul C. Gutjahr

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Book of Mormon

By Paul C. Gutjahr, Freelance Designer Daren Magee

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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.