John G. Hemry Books

Stark's War

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The Americans were the first to set foot on the moon. They intend to be the last. The United States of America reigns over Earth as the last surviving superpower. To build a society free of Ameri...

Stark's Command

By John G. Hemry

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HE STARTED A REBELLION. NOW HE'LL HAVE TO LEAD IT.United States military forces on the moon have overthrown the ranking officers and placed Sergeant Ethan Stark in command. Now, in addition to fi...

Stark's Crusade

By John G. Hemry

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HE SWORE TO PROTECT AND SERVE. NOW HE HAS TO CHOOSE BETWEEN THEM.When the American Lunar colony was threatened, he served his country in battle. But when high ranking officers betrayed him and his...

A Just Determination

By Jack Campbell, John G. Hemry

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Burden of Proof

By Jack Campbell, John G. Hemry

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Rule of Evidence

By Jack Campbell, John G. Hemry

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Against All Enemies

By Jack Campbell, John G. Hemry

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Stark s War

By John G. Hemry

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Stark s Crusade

By John G. Hemry

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Burden of Proof

By John G. Hemry

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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.