Gerald Astor Books

The Pga World Golf Hall of Fame Book

By Gerald Astor

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Presidents at War: From Truman to Bush, The Gathering of Military Powers To Our Commanders in Chief

By Gerald Astor

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"For nearly five months, starting in mid-September 1944, American GIs battled for the Huertgen Forest, a fifty-square mile tract of extremely inhospitable terrain. Unfortunately for the American so...

Semper Fi in the Sky

By Gerald Astor

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Here, one of America’s most popular military historians re-creates, using their own moving and powerful voices, the true stories of the U.S. Marine pilots who flew the Allies to victory in Wo...

The Mighty Eighth

By Gerald Astor

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In the skies of World War II Europe, the Eighth Air Force was a defining factor in turning the tide against the Nazis. In these gripping oral histories, the sacrifice, savagery, and supremacy of th...

Greatest War Volume I

By Gerald Astor

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Presidents at War

By John P Murtha, Gerald Astor

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Presidents at War

By Amercoll Obstet, Gerald Astor, John P Murtha

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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.