Mary Downing Hahn Books

In the summer before World War I, nine-year-old Anna is happy to spend a week at her aunt and uncle's Beltsville, Maryland, farm until she meets Theodore, who calls her a "city slicker" and spurs...

Janey and the famous author

By Mary Downing Hahn

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Third-grader Janey is so excited about meeting her favorite author at a literature festival that she almost ruins the day for her entire class.

The Old Willis Place: A Ghost Story

By Mary Downing Hahn

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Tired of the rules that have bound them ever since "the bad thing happened," twelve-year-old Diana ignores her brother's warnings and befriends the daughter of the new caretaker, setting in motion...

Witch Catcher

By Mary Downing Hahn

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Having just moved into the West Virginia home they inherited from a distant relative, twelve-year-old Jen is surprised that her father is already dating a local antiques dealer, but more surprised...

Deep and dark and dangerous

By Mary Downing Hahn

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When thirteen-year-old Ali spends the summer with her aunt and cousin at the family's vacation home, she stumbles upon a secret that her mother and aunt have been hiding for over thirty years.

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.