John Dooley Books

John Dooley, Confederate soldier

By John Dooley

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Lewis Carroll's The hunting of the snark

By Lewis Carroll

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John Dooley Confederate Soldier

By Joseph T. Durkin, Douglas Southall Freeman, John Dooley

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Software development and professional practice

By John Dooley

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A Brief History of Cryptology and Cryptographic Algorithms

By John F. F. Dooley

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The science of cryptology is made up of two halves. Cryptography is the study of how to create secure systems for communications. Cryptanalysis is the study of how to break those systems. The confl...

History of Cryptography and Cryptanalysis

By John F. Dooley

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Dusty Lady

By John Dooley

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Software development and professional practice

By John Dooley

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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.