David Goudsward Books

Westford Knight and Henry Sinclair

By David Goudsward

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Wittier Than Thou

By Ken Faig Jr., David Goudsward, Jeff Strand, Oliver Wendell Holmes

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Sun Sand and Sea Serpents

By David Goudsward

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Merbeings

By Hall Mark A., David Goudsward, Loren Coleman

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America's Stonehenge: The Mystery Hill Story

By Robert Stone, David Goudsward

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"America's Stonehenge sits atop Mystery Hill in North Salem, NH. It is an acre of stone structures surrounded by a 12-acre calendar. Alignments and carbon dating indicate the site was built 4000 ye...

Pulp Adventures 39

By David Goudsward, O. Henry, Charles Boeckman, John Burke, Laurie Powers

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Old World Footprints

By Cassie Symmes, David Goudsward

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Horror Guide to Massachusetts

By David Goudsward, Scott T Goudsward

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Lovecraft and the Great Altar Stones of New England

By David Goudsward

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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.