Robert L. O Connell Books

Sacred Vessels

By Robert L. O Connell

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Fierce Patriot

By Robert L. O Connell

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NATIONAL BESTSELLER • William Tecumseh Sherman was more than just one of our greatest generals. Fierce Patriot is a bold, revisionist portrait of how this iconic and enigmatic figure...

Sacred Vessels

By Robert L. O Connell

Average: 0.00, 0 Ratings

Sacred Vessels

By Robert L. O Connell

Average: 0.00, 0 Ratings

Sacred Vessels

By Robert L. O Connell

Average: 0.00, 0 Ratings

Fierce Patriot

By Robert L. O Connell

Average: 0.00, 0 Ratings

The ghosts of Cannae

By Robert L. O Connell

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Ride of the second horseman

By Robert L. O Connell

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In Ride of the Second Horseman, Robert O'Connell probes the distant human past to show how and why war arose. He begins with a definition that distinguishes between war and mere feuding: war involv...

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.