Douglas Gresham Books

Lenten Lands

By Douglas H. Gresham

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The Narnia Cookbook: Foods from C.S. Lewis's Chronicles of Narnia

By Douglas H. Gresham

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A collection of recipes devised from some of the foods mentioned in the Chronicles of Narnia, along with a history of the dishes and anecdotes from Lewis's life.

Jack s Life

By Douglas Gresham

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Official Narnia Cookbook

By Pauline Baynes, Douglas Gresham

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Jack s Life

By Douglas Gresham

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Marquis of Lossie

By David Jack, Carrie Stout, Douglas Gresham, Gilbert Keith Chesterton, Jess Lederman

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Lenten Lands

By Douglas Gresham

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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.