Norris Dewar McWhirter Books

Presents a collection of record-setting miscellany including the largest pizza ever baked, an egg with nine yolks, and the longest duration swim by a woman.

Guinness book of daring deeds & fascinating facts

By Norris Dewar McWhirter

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Presents a collection of record-setting miscellany including the largest pizza ever baked, an egg with nine yolks, and the longest duration swim by a woman.

Guinness Sports Record Book 1979 1980

By Norris Dewar McWhirter

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Guiness Book of World Records

By Norris Dewar McWhirter

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Guinness book of superstunts & staggering statistics

By Norris Dewar McWhirter

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Presents a potpourri of facts concerning natural events, people, and their activities.

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.