Jim Ollhoff Books

Malaria
Malaria

By Jim Ollhoff

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Smallpox
Smallpox

By Jim Ollhoff

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What Are Germs
What Are Germs

By Jim Ollhoff

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Fossil Fuels
Fossil Fuels

By Jim Ollhoff

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Nuclear Energy
Nuclear Energy

By Jim Ollhoff

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Solar Power
Solar Power

By Jim Ollhoff

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Wind and Water
Wind and Water

By Jim Ollhoff

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World in Crisis
World in Crisis

By Jim Ollhoff

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Related Articles from our Blog

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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