Gerard Helferich Books

Theodore Roosevelt and the assassin

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"Rich with local color, period detail, and a fully realized historical and political backdrop, the forgotten story of the lone, fanatical assailant who stalked Theodore Roosevelt on the 1912 presid...

High Cotton

By Gerard Helferich, Jeremy Gage

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High Cotton

By Gerard Helferich, Gerry Helferich

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Humboldt s Cosmos

By Gerard Helferich

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Stone of kings

By Gerard Helferich

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Stone of Kings

By Gerard Helferich

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Stone of Kings

By Gerard Helferich

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Theodore Roosevelt and the Assassin

By Gerard Helferich

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Theodore Roosevelt and the Assassin

By Gerard Helferich

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High Cotton

By Gerard Helferich

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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.