Challen Books

Diesel Engine Reference Book
Diesel Engine Reference Book

By Rodica Baranescu, Bernard Challen, Challen

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the Diesel Engine Reference Book, Second Edition, Is A Comprehensive Work Covering The Design And Application Of Diesel Engines Of All Sizes. The First Edition Was Published In 1984 And Since That...

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Life In Ancient China (Peoples Of The Ancient World (Paperback))
Life In Ancient China (Peoples Of The Ancient World (Paperback))

By Paul C Challen, EBSCO Publishing (Firm), Paul Challen, Paul C. Challen, Challen

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Ancient China gave the world paper, a counting machine called an abacus, Kung Fu, and many other interesting inventions. Chinese society is one of the oldest on earth. Children will delight in lear...

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Mighty Tanks
Mighty Tanks

By PAul, Paul C Challen, Challen

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Get To Know Screws
Get To Know Screws

By PAul, Paul C. Challen, Challen

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Get To Know Wheels And Axles
Get To Know Wheels And Axles

By PAul, Paul C. Challen, Challen

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Read all about wheels and axles and their many uses in this new book. Children will be thrilled to learn of their many uses, from doorknobs to the insides of a clock. There are wheels that move, tu...

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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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