Harlow Giles Unger Books

John Hancock

By Harlow Giles Unger

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Thomas Paine and the Clarion Call for American Independence

By Harlow Giles Unger

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John Hancock: Merchant King and American Patriot

By Harlow Giles Unger, Unger Harlow G.

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"He was a rich, powerful aristocrat, a merchant king who loved English culture and fashion, and, above all, he was a loyal British subject with ambitions of a lordship and a grand retirement estate...

Robert Morris

By Harlow Giles Unger

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American Tempest

By Harlow Giles Unger

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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.