Colin H. Walker Books

Nuestro Sistema Solar
Nuestro Sistema Solar

By Colin H. Walker

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Electricity
Electricity

By Colin H. Walker

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Explores the properties of simple circuits and inventive ways of putting them to use for light and power.

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Inside the earth
Inside the earth

By Colin H. Walker

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Describes the internal structure of the earth and how it affects the surface by producing such natural phenomena as geysers, earthquakes, and volcanoes.

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Organic Pollutants
Organic Pollutants

By Colin H. Walker

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Organic Pollutants
Organic Pollutants

By Colin H. Walker

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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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