John Grehan Books

Dunkirk Nine Days That Saved An Army

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By the winter of 1810?11, the armies of Napoleon had overrun most of Spain and Joseph Bonaparte sat on the throne in Madrid. But the Spanish Government had found refuge in the fortress-port of Cadi...

The Battle of Barrosa, 1811

By John Grehan

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Voices from the past

By John Grehan

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The Western Front 1917 1918

By Sir Douglas Haig

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The Crimean War

By Martin Mace, John Grehan

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Disaster in the Far East 1940 1942

By Mitchell Sara Military History Researcher, Martin Mace, John Grehan

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Far East air operations 1943 1945

By Mitchell Sara Military History Researcher, Martin Mace, John Grehan

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The war in Italy 1943 1944

By Mitchell Sara Military History Researcher, Martin Mace, John Grehan

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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.