David Poyer Books

The crisis

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Assigned to improve an undisciplined patrol craft squadron in the Red Sea, Naval Commander Dan Lenson and his Tactical Analysis Group find themselves on a humanitarian mission in famine-stricken no...

The Gulf A Dan Lenson Novel

By David Poyer

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Ghosting

By David Poyer

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The Circle

By David Poyer

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The towers

By David Poyer

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Surviving the September 11 attack on the Pentagon only to lose his wife at the World Trade Center, Commander Dan Lenson joins a SEAL team assigned to track down Osama bin Laden and other senior Tal...

Tomahawk

By David Poyer

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A thriller on the development of the Tomahawk nuclear-tipped missile, whose protagonist is Dan Lenson of the U.S. Navy. His life is thrown in turmoil when his peace-activist girlfriend is murdered...

Task Force 61

By David Poyer

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Hatteras Blue

By David Poyer

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Fire on the Waters

By David Poyer

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Only Thing to Fear

By David Poyer

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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.