Harold Hellman Books

The Art and Science of Color
Great Feuds in Medicine
The Lever and the Pulley
The Lever and the Pulley

By Harold Hellman

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Biology in the world of the future
The City in the World of the Future
Feeding the World of the Future
Energy in the World of the Future
Communications in the world of the future
Technophobia
Technophobia

By Harold Hellman, Hal Hellman

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Deadly bugs and killer insects
Deadly bugs and killer insects

By Hal Hellman

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Describes a variety of bugs and insects and their harmful effects on the health of man and his pets and livestock.

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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.

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