Jonathan E. Helmreich Books

Rebirth

By Paul C. Helmreich, A. James Mcadams, Cyril Black, Robert English, Jonathan E. Helmreich

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To Petersburg with the Army of the Potomac

By Levi Bird Duff

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"The letters of Levi Bird Duff are unusual for their literacy, descriptions and continuity, the strength of opinions expressed, and their source. Written only for the eyes of Duff's love, the messa...

Gathering Rare Ores

By Jonathan E. Helmreich

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Gathering Rare Ores

By Jonathan E. Helmreich

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Belgium and Europe

By Jonathan E. Helmreich

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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.