John Brennan Books

What Kind Of University
What Kind Of University

By John Brennan

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A Is for Australia
A Is for Australia

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Principles Of Ems Systems
Principles Of Ems Systems

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Zoo day
Zoo day

By Brennan John

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An hour-by-hour description, in text and photographs, of a typical day at the zoo and what happens to the various animals.

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Training for ECDL Syllabus 3
Training for ECDL Syllabus 3

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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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