Thomas Mark Books

The Itaipu Dam

By Thomas Mark

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A look at the Itaipu Dam on the Parana River in South America, between Brazil and Paraguay.

The Discoverer Enterprise

By Thomas Mark

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Introduces the Discoverer Enterprise, a ship that drills for oil under the ocean floor in the Gulf of Mexico.

What Every Pianist Needs to Know About the Body

By Thomas Mark, Roberta Gary, Thom Miles, Thomas Carson Mark

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"Even as a young man, Hitler was often angry. When things didn't go his way, he always looked for someone to blame. After Germany was defeated in World War I, Hitler became determined to rebuild it...

Mastering people management

By Thomas Mark

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High-performance consulting skills

By Thomas Mark

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Crop agronomy with particular attention toward new techniques for pest control.

By Thomas Mark

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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.