John Hergenrather Books

Your guide to the Grand Canyon

By Tom Vail

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Your guide to Zion and Bryce Canyon

By Michael Oard

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Your guide to Yellowstone and Grand Teton national parks

By John Hergenrather

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A guide to Yellowstone and Grand Teton national parks from the perspective of creation science.

Road guide to Yellowstone National Park and adjacent areas

By Harold G. Coffin, John Hergenrather, Michael J. Oard, Dennis Bokovoy

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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.