Mark E. Dudley Books

Examines the people, events, and legal issues involved in the Supreme Court case that established the right of the accused to be represented by a lawyer even if they cannot afford to pay.

Engel v. Vitale (1962)

By Mark E. Dudley

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Points out that although a 1962 Supreme Court case decided that official prayers in public schools are unconstitutional, the issue of separation of church and state remains.

An eye to the sky

By Mark E. Dudley

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Describes the telescopes, rockets, satellites, and space probes by which humans have pursued unmanned exploration of outer space.

Epilepsy

By Mark E. Dudley

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Discusses the causes, diagnosis, and treatment of epilepsy, the types of seizures, and the challenges of living with the disease.

Epilepsy Health Watch

By Mark E. Dudley

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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.