John Vornholt Books

River quest

By John Vornholt

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Mummies

By John Vornholt

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Dolphin Watch

By John Vornholt

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After thirteen-year-old Milos helps rescue a sailor in the open sea beyond Dinotopia's coral reef, he and some dolphins become involved with the young man's efforts to return home.

Break a leg!

By John Vornholt

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How to sneak into the girls' locker room

By John Vornholt

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Voices Babylon 5 Book 1

By J. Michael Straczynski, John Vornholt

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Blood Oath Babylon 5 Book 3

By J. Michael Straczynski, John Vornholt

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Leather Wings Earth 2 Book 3

By John Vornholt

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The Seven 2

By John Vornholt

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The return

By John Vornholt

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The survivors of Flight 29 discover that they are not alone.

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.