Welwyn Wilton Katz Books

The prophecy of Tau Ridoo

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The Aubrey children are transported to mysterious world by a sorceress and a prince to help defeat the Red Guard, an evil force which has kept the world in darkness for over 700 years.

Witchery Hill

By Welwyn Wilton Katz

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Sun God Moon Witch

By Welwyn Wilton Katz

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False face

By Welwyn Wilton Katz

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Thirteen-year-old Laney, troubled by the animosity between her divorced parents, and fourteen-year-old Tom, determined to preserve his Indian identity, form an uneasy alliance after finding rare In...

The third magic

By Welwyn Wilton Katz

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In this interpretation of the Arthurian legend, fifteen-year-old Morgan Lefevre is mistaken for one of her ancestors while visiting England, summoned to the alien world of Nwm, and caught between t...

False Face

By Welwyn Wilton Katz

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Whalesinger

By Welwyn Wilton Katz

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The Third Magic

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Whalesinger

By Welwyn Wilton Katz

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Time Ghost

By Welwyn Wilton Katz

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In 2044 in an ecologically destroyed Canada, Sara and her friend Dani accompany Sara's grandmother to the still unspoiled North Pole and there begin an adventure in time that helps them understand...

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.