Erin Callahan Books

Beautifully Bipolar
Beautifully Bipolar

By Erin Callinan

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The art of escaping
The art of escaping

By Erin Callahan

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When Mattie, seventeen, seeks out the reclusive Miyu, daughter of a famed escapologist, to indulge her secret desire to learn the craft, it leads to a friendship with classmate Will, who bears a hu...

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Tunnelville
Tunnelville

By Erin Callahan, Troy H. Gardner

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Service Line Solution
Service Line Solution

By Erin Callahan

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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.

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