Dan Harper Books

Sit, Truman

By Dan Harper

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A busy day in the life of Truman the dog includes walks, play time, and a little dog named Oscar.

Telling Time with Big Mama Cat

By Dan Harper

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A cat describes her activities at various times throughout the day from morning to night. Features a clock with movable hands.

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.

Dan Harper Books

Sit, Truman

Sit, Truman!

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Sit Truman

Sit Truman

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