Bob Kolar Books

Do You Want to Play
Do You Want to Play

By Bob Kolar

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Do You Want To Play?
Do You Want To Play?

By Bob Kolar

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Two friends visit Friendship Park, where they explore the ins and outs, the ups and downs of friendship and discover the many things they can do together.

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Racer Dogs
Racer Dogs

By Bob Kolar

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Big Kicks
Big Kicks

By Bob Kolar

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Do You Want to Play
Do You Want to Play

By Bob Kolar

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Do You Want to Play a Book About Being Friends
Un gato y un perro
Un gato y un perro

By Claire Masurel, Bob Kolar

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Un gato y un perro
Un gato y un perro

By Claire Masurel, Bob Kolar

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A Cat and a Dog Un gato y un perro
Big Kicks
Big Kicks

By Bob Kolar

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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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