George B. Clark Books

The Fourth Marine Brigade in World War I

By George B. Clark

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Devil Dogs

By Clark George B., George B. Clark

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Historian George B. Clark tells the complete, never before published story of the extraordinary contributions of the Marine combat service in World War I. Devil Dogs is the first book to examine th...

Devil Dogs Fighting Marines of World War I

By George B. Clark

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With the Old Corps in Nicaragua

By Clark George B.

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"A primary preoccupation of the United States Marine Corps between the world wars were the so-called "Banana Wars" in Nicaragua during the 20s and 30s. Over the years the Corps' presence ebbed and...

Our Masonic Heritage

By George B. Clark

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Irish soldiers in Europe 17th 19th century

By Clark George B.

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The Irish Soldier in the European Wars 1585 1818

By Clark George B., George B. Clark

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Treading Softly

By Clark George B.

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The American Expeditionary Force in World War I

By Clark George B.

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"This volume offers comprehensive statistical history of the American Expeditionary Force. After an overview of each of the actions and battles in which the AEF participated, the book chronicles th...

Battle history of the United States Marine Corps 1775 1945

By Clark George B.

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"This book describes the engagements from the formation of the Continental Marines to the corps' exercise at Okinawa. Organized chronologically, the individual skirmishes illustrate how each of the...

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.