Katrina O Neill Books

Decoding the Mayan marvels

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When Uncle Earl disappears while searching for the ancient Mayan library in the jungles of Central America, Ricky and Mia are not the only ones trying to find both Earl and the lost library.

In search of the Egyptian queen

By Katrina O Neill

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While visiting a Cairo museum, Ricky and Mia suddenly find themselves in ancient Egypt, trying to save Queen Hatshepsut from the plotting of her evil vizier.

Quest for the cup

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Uncle Earl takes Mia and Ricky to Glastonbury Abbey in England to help his friend Professor Black, who is searching for the Holy Grail.

Racing for the Birdman

By Katrina O Neill

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Uncle Earl takes Mia and Ricky to Rapa Nui for the annual egg race when he is summoned to find out why the island is experiencing bouts of strange red rain.

Key of the Mayan kingdom

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Missing among the pyramids

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Hunting down the grail

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The red rain of Easter Island

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Protecting the sunken city

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Sheng bei chuan qi

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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.