Mary Thelen Books

The hospital scares me

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After being rushed to the hospital with a broken ankle, Dan gradually grows less afraid as he receives emotional support and explanations of everything that happens to him.

If a Tree Could Talk

By Mary Thelen, Rozanne Lanczak Williams

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16 pages

Barney Bear Gets Dressed

By Mary Thelen, Rozanne Williams

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Barney Bear World Traveler

By Kimberly Jordano, Marcia Fries, Trisha Callella, Renee Keeler, Mary Thelen

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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.