Robert J. Groden Books

The Killing of a President: The Complete Photographic Record of the Jfkassassination, the Conspiracy, And the Cover-up

By Robert J. Groden

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High treason

By Robert J. Groden, R. Groden

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High Treason The Assassination of President John F Kennedy and the New Evidence of Conspiracy

By Robert J. Groden, Harrison Edward Livingstone

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The Killing Of A President: The Complete Photographic Record Of The JFK Assassination...

By Robert J. Groden

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The assassination of John F. Kennedy remains the greatest unsolved mystery in American political history. Though hundreds of books have been written on this topic, an in-depth photographic analysis...

The Search for Lee Harvey Oswald: A Comprehensive Photographic Record

By Robert J. Groden

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The killing of a President

By Robert J. Groden

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The killing of a president

By Robert J. Groden

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High treason

By Harrison Edward Livingstone

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A nation lost its innocence on November 22, 1963, the day that President John F. Kennedy was killed by an assassin's bullet in Dallas. Thirty-five years later the nation continues to suffer the aft...

High treason

By Robert J. Groden

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High treason

By Robert J. Groden

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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.