Charles A. Goodrum Books

The Best Cellar: A Werner-Bok Library Mystery

By Charles A. Goodrum

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Dewey Decimated

By Charles A. Goodrum

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The best cellar

By Charles A. Goodrum

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I'll trade you an elk

By Charles A. Goodrum

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Dewey decimated

By Charles A. Goodrum

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Rumors of forgeries and counterfeits--and the grisly death of a distinguished librarian--at the prestigious Werner-Bok Library bring together three unlikely sleuths.

Carnage of the Realm

By Charles A. Goodrum

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Dead for a penny

By Charles A. Goodrum

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Treasures of the Library of Congress

By Charles A. Goodrum

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Treasures of the Library of Congress

By Charles A. Goodrum

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Photographs and accompanying text describe the wide range of objects housed in the Library of Congress.

Advertising in America

By Charles A Goodrum

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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.