Tom McGowen Books

Album of sharks

By Tom McGowen

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A general introduction to sharks with specific descriptions of twelve different kinds.

Album of dinosaurs

By Tom McGowen

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A brief introduction to the history and characteristics of dinosaurs in general and specific descriptions of twelve different kinds.

Album of dinosaurs.

By Tom McGowen

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A brief introduction to the history and characteristics of dinosaurs in general and specific descriptions of twelve different kinds.

Album of prehistoric animals.

By Tom McGowen

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

Album of prehistoric animals.

By Tom McGowen

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

Album of prehistoric man

By Tom McGowen

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A brief introduction to the evolution and characteristics of prehistoric people from apelike prehumans to modern man.

Album of whales

By Tom McGowen

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Introduces various types of whales, dolphins, and porpoises.

Album of rocks and minerals

By Tom McGowen

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Describes the formation and uses of the world's leading minerals.

Album of birds

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.

Midway and Guadalcanal

By Tom McGowen

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Details the World War II battles between the Americans and the Japanese at the Pacific islands of Midway and Guadalcanal.

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.