Tom McGowen Books

The last voyage of the unlucky Katie Marie.

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After spending all his money on a cargo to trade in India, the captain of the Unlucky Katie Marie is forced to use chunks of ice to ballast the ship.

Gran libro de animales prehistoricos

By Tom McGowen

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A brief, general introduction to the history and characterists of prehistoric mammals in general, and specific descriptions of 12 different kinds.

El gran libro de astronomia

By Tom McGowen

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An introduction of astronomy, including a survey of the solar system, stars, comets, and the universe.

Gran libro de aves

By Tom McGowen

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Discusses the evolution of birds from reptiles, the way of life of different types of birds, the adaptation of species to their niches, the care of baby birds, and migration.

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.