Patrick Culhane Books

Black Hats: A Novel of Wyatt Earp and Al Capone

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Visiting Brooklyn to assist deputy-turned-sportswriter Bat Masterson during a showdown with Prohibition-era mobsters, detective Wyatt Earp struggles to protect a speakeasy once belonging to the lat...

Red Sky in Morning

By Patrick Culhane

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A young naval ensign must unmask a killer on board an ammunitions ship in this intriguing novel of suspense, set during World War II, from the acclaimed author of "Black Hats."

Black Hats

By Patrick Culhane

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Red Sky in Morning

By Patrick Culhane

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Black Hats

By Patrick Culhane

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Red Sky in Morning: A Novel of World War II: Library Edition

By Patrick Culhane

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Red Sky in Morning: A Novel of World War II

By Patrick Culhane

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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.