Thomas Downs Books

Logic Design With Pascal: Computer Aided Design Techniques

By Thomas Downs, Mark F. Schulz

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Endangered animals

By Thomas Downs

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Photographs of animals at play with animal facts.

Endangered Animals

By Thomas Downs, Weldon Weldon Owen

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Farm Animals

By Karen Perez, Weldon Weldon Owen

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Some of the most familiar animals are the friendly faces found on the farm. From ducks to donkeys, horses to hens, these animals have a special relationship with the people who care for them--and w...

Farm animals

By Thomas Downs

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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.