Mary Downing Hahn Books

Took

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"A witch called Old Auntie is lurking near Dan's family's new home. He doesn't believe in her at first, but is forced to accept that she is real and take action when his little sister, Erica, is 't...

One for sorrow

By Mary Downing Hahn

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Against the ominous backdrop of the influenza epidemic of 1918, Annie, a new girl at school, is claimed as best friend by Elsie, a classmate who is a tattletale, a liar, and a thief. Soon Annie mak...

A Haunting Collection by Mary Downing Hahn Deep and Dark and Dangerous All the Lovely Bad Ones and Wait Till Helen Comes

By Mary Downing Hahn

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The old Willis place

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...

Deep Dark and Dangerous

By Mary Downing Hahn

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The ghost of Crutchfield Hall

By Mary Downing Hahn

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In the nineteenth century, ten-year-old Florence Crutchfield leaves a London orphanage to live with her great-uncle, great-aunt, and sickly cousin James, but she soon realizes the home has another...

Daphne s Book

By Mary Downing Hahn

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All the Lovely Bad Ones

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All the Lovely Bad Ones

By Mary Downing Hahn

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A Haunting Collection by Mary Downing Hahn Deep and Dark and Dangerous All the Lovely Bad Ones and Wait Till Helen Comes

By Mary Downing Hahn

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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.