Hellman, Harold Books

The Art and Science of Color

By McGraw Hill Book Co.

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Light and Electricity in the Atmosphere

By Hellman Harold

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Energy in the World of the Future

By Harold Hellman, Hal Hellman

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Transportation in the world of the future

By Hal Hellman, Harold Hellman

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Describes the function and operation of a variety of vehicles that may be in general use in the future.

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.