Hall Judy Books

Napoleon s oracle
Napoleon s oracle

By Hall Judy

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The illustrated guide to divination
The illustrated guide to crystals
The art of psychic protection
The art of psychic protection

By Hall Judy

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101 power crystals
101 power crystals

By Hall Judy

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Crystal prescriptions
Crystal prescriptions

By Hall Judy

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This Bible has become the world's favourite crystal reference guide, having sold over a million copies. The directory format enables you to find a known crystal instantly or to identify an unknown...

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The crystal healing pack
The crystal healing pack

By Hall Judy

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The crystal healing pack
The crystal healing pack

By Hall Judy

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Astrologiia
Astrologiia

By Hall Judy

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Crystals and sacred sites
Crystals and sacred sites

By Hall Judy

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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.

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