Harold Rober Books

Going camping

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What do you need to go camping? What do you do once you reach the campsite? Learn all about going camping in this reading-level-appropriate text! Vibrant photos draw the reader in to the fun of exp...

El velocirraptor

By Harold T. Rober

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Introduces the Velociraptor, describing its physical features and the ways in which they help the dinosaur hunt for prey.

El mamut lanudo

By Harold T. Rober

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Introduces the prehistoric animal, the woolly mammoth, describing its physical features and the ways in which it stayed safe by living in groups.

I Love Cats

By Intuitive, Harold Rober

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I Love Cats

By Intuitive, Harold Rober

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I Love Goldfish

By Intuitive, Harold Rober

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I Love Goldfish

By Intuitive, Harold Rober

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I Love Guinea Pigs

By Intuitive Staff, Harold Rober

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I Love Guinea Pigs

By Intuitive, Harold Rober

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I Love Hamsters

By Intuitive Staff, Harold Rober

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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.