Geo Ham Books

Real Teens
Real Teens

By Geo Ham

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High school students in their junior year candidly share their thoughts and intimate feelings on diverse and personal issues.

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Hey diddle diddle
Hey diddle diddle

By Geo Ham, Jill McDonald

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"Babies & kids love to rub 'em."--P. [1] of cover.

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BMW 3 series Z4 Models
BMW 3 series Z4 Models

By Geo Ham, Robert Maddox

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Toyota Corolla
Toyota Corolla

By Geo Ham

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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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