Marcia S. Gresko Books

My Discovery Book About Numbers My Discovery
About the Farm My Discovery Books
About the Zoo
The Grand Coulee Dam
The Grand Coulee Dam

By Marcia S. Gresko

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World of Communities Student Text paperback edition World of Communities
World of Communities Activity Book World of Communities
World of Communities Teacher s Guide World of Communities
Letters Home From China Letters Home From
Letters Home From China Letters Home From

By Marcia S. Gresko

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Describes some of the sights and experiences on a trip through China, including visits to Beijing, the Great Wall, Taiyuan, Shanghai, and Hangzhou.

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Letters Home From - Egypt (Letters Home From)
Letters Home From - Egypt (Letters Home From)

By Marcia S. Gresko

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Describes some of the sights and experiences on a trip to Egypt, including visits to Cairo, Giza, Alexandria, Luxor, and Thebes.

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Mexico
Mexico

By Marcia S. Gresko

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Describes some of the sights and experiences on a trip through Mexico, including visits to Mexico City, Oaxaca, Chichen Itza, and Baja California.

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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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