John Dvorak Books

The last volcano

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Documents the fifty-year career of Thomas Jaggar, the Harvard-educated volcano science pioneer who founded the Hawaiian Volcano Observatory, to share insights into his findings about massive volcan...

Mask of the Sun

By John Dvorak

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432 pages (large print) : 23 cm

The last volcano

By John Dvorak

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Mask of the sun

By John Dvorak

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Eclipses have stunned, frightened, emboldened and mesmerized people for thousands of years. They have been thought of as harbingers of evil as well as a sign of the divine. An amazing phenomena uni...

John C. Dvorak's PC crash course and survival guide

By John Dvorak

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Earthquake Storms

By John Dvorak

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Earthquake Storms

By John Dvorak

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Earthquake Storms

By John Dvorak

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Earthquake Storms

By John Dvorak

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PC Magazine 1994 Computers Buyers Guide

By John C. Dvorak

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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.