P. K. Hallinan Books

How really great to walk this way
Por Amor a Nuestra Tierra for the Love of Our Earth
Today Is Easter Today Is... Paperback
Today Is Halloween Today Is...
Today Is Christmas Today Is... Paperback
We re Very Good Friends My Mother and I
That s What A Friend Is
That s What A Friend Is

By P. K. Hallinan

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Rainbow of Friends
Rainbow of Friends

By P. K. Hallinan

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We re Very Good Friends My Brother and I
I love you God
I love you God

By P. K. Hallinan

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Children tell God how much they love Him and try to show Him in all they say and do.

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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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