James Hahn Books

Hamsters Gerbils Guinea Pigs Pet Mice and Pet Rats
Henry the Sports Career of Henry Aaron
Recycling re-using our world's solid wastes
Recycling re-using our world's solid wastes

By James Hahn

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Explains recycling, man's need of it, and present and suggested methods of performing the task for reusing waste materials.

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The metric system
The metric system

By James Hahn

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Traces the history of the metric system, discusses its adoption by various countries, and explains how to use it.

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Environmental careers
Environmental careers

By James Hahn

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Discusses the education and training required for a variety of careers in the environmental field.

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Hamsters, gerbils, guinea pigs, pet mice, & pet rats
Hamsters, gerbils, guinea pigs, pet mice, & pet rats

By James Hahn

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General information on the history of these rodents and instructions for raising them as pets.

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Plastics
Plastics

By James Hahn

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Describes the chemistry, manufacture, and history of plastics, and discusses their many uses now and in the future.

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Aim for a job in a small business occupation
Exploring careers in home economics
Aim for a job in appliance repair
Aim for a job in appliance repair

By James Hahn

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Discusses careers in household appliance repair and describes how one can learn to service and repair appliances.

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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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