Geoffrey Gray Books

Skyjack: The Hunt for D. B. Cooper

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"Geoffrey Gray reopens one of the great unsolved criminal cases of the 20th century: the puzzling story of "D. B. Cooper," the only skyjacker never to be caught by authorities"--Provided by publisher.

SKYJACK

By Geoffrey Gray

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Through a smoky mirror

By Mandy Paul, Geoffrey Gray

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A Cautious Silence

By Geoffrey Gray

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Abrogating responsibility

By Geoffrey Gray

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Skyjack

By Geoffrey Gray

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NEW YORK TIMES BESTSELLER • The true, unsolved story of D. B. Cooper’s 1971 airplane hijacking, one of the greatest cold cases of the twentieth century, by an author featured in D.B. Cooper: Where...

Chicanery

By Geoffrey Gray

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Scholars at war

By Christine Winter, Doug Munro, Geoffrey Gray

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Chicanery

By Christine Winter, Doug Munro, Geoffrey Gray

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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.