John Koblas Books

When the heavens fell

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Thoroughly researched account of the three Younger brothers' life in Stillwater Prison after their failed Northfield, Minnesota bank robbery. Includes their capture in a shoot-out, incarceration, t...

The Great Cole Younger and Frank James Historical Wild West Show

By John J. Koblas

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The Great Cole Younger and Frank James Historical Wild West Show

By John J. Koblas

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When the heavens fell

By John J. Koblas

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Robbers of the Rails

By John J. Koblas

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The Swamp Fox and The Columbine

By John Koblas

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Bushwacker Cole Younger and the Kansas Missouri Border War

By John J. Koblas

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Peril at Pig s Eye Cave

By John Koblas

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The Return of Jesse James

By John Koblas

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The F. Scott Fitzgerald Caper

By John Koblas

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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.