Maggie Rennert Books

Circle of death

By Maggie Rennert

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Operation Calpurnia: A Guy Silvestri mystery

By Maggie Rennert

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Operation Alcestis

By Maggie Rennert

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The Gemini Contenders

By Maggie Rennert

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Salonika, Greece: December 1939. In the dead of night, a clandestine order of monks embarks on a desperate mission: to transport a mysterious vault to a hiding place high in the Italian Alps. The s...

I love you

By Maggie Rennert

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Describes the many ways to say "I love you" to animals, relatives, friends, and the world.

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.