Duffy James Books

The man in the river

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Twelve-year-old Sandy and ten-year-old Kate, whose father has become the town drunk, receive investigative help from a retired policewoman when their father drowns mysteriously in the river after b...

The Graveyard Gang

By Duffy James

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During the summer after seventh grade, life in a small New Hampshire town improves for Amy, when new friendships help her deal with her father's death, her mother's emotional problems, and the accu...

Radical Red

By Duffy James

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The life of a twelve-year-old Irish girl living in Albany, New York, in the 1890s undergoes many changes when she and her mother become involved with Susan B. Anthony and her suffragist.

Sand of the arena

By Duffy James

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The Fight for Rome

By James Duffy, Duffy James

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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.