John W. Hartmann Books

The trials of a New Jersey criminal defense attorney

By John W. Hartmann

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The American partisan

By John W. Hartmann

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"The years 1776-1780 were the pivotal period during the Revolutionary War.". "At the center of practically every important military event during those four long years was a young cavalry officer,...

The American partisan

By John W. Hartmann

Average: 0.00, 0 Ratings

"The years 1776-1780 were the pivotal period during the Revolutionary War.". "At the center of practically every important military event during those four long years was a young cavalry officer,...

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.