Catherine Urdahl Books

Emma s Question

By Catherine Urdahl

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Virginia Was a Spy

By Catherine Urdahl, Gary Kelley

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Polka-Dot Fixes Kindergarten

By Catherine Urdahl Author Mai S. Kemble Illustrator

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It's Polka-dot's first day of kindergarten and armed with her trusty fix-it kit, she can handle anything—just like her Grandpa. When she gets to school, though, everything goes wrong. Her nam...

Polka-Dot Fixes Kindergarten

By Catherine Urdahl Author Mai S. Kemble Illustrator

Average: 0.00, 0 Ratings

It's Polka-dot's first day of kindergarten and armed with her trusty fix-it kit, she can handle anything—just like her Grandpa. When she gets to school, though, everything goes wrong. Her nam...

Emma s question

By Cathy Nelson Urdahl

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When Emma's grandmother, who takes care of her after school and takes her out for bagels on Wednesdays, gets sick and has to go to the hospital, Emma is afraid that she will die--but she is also af...

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.