Douglas Campbell Books

Mathematics
Mathematics

By Douglas M. Campbell

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Moulton Geden
Moulton Geden

By I. Howard Marshall

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Theater
Theater

By Campbell Douglas

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Describes the different jobs in the theater--acting, directing, managing, writing, costume designing, and others.

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Flag Mischief
Flag Mischief

By Douglas Campbell

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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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