Aaron W. Percefull Books

Gymnastics

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An introduction to gymnastics, with advice on safety and training, descriptions of the competitive events, and a glossary.

Balloons, zeppelins, and dirigibles

By Aaron W. Percefull

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Traces the history of airships from the eighteenth century to the present describing the principal inventors, various models, and uses of balloons, dirigibles, and zeppelins. Also includes a list o...

The Nile

By Aaron W. Percefull

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Traces the modern history of the Nile River, emphasizing the efforts of nineteenth-century explorers to discover the river's source and twentieth-century projects to exploit its resources.

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.