Lud Duroska Books

Football Rules
Football Rules

By Schiffer, Duroska

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Football rules in pictures
Great pro quarterbacks.
Great pro quarterbacks.

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Great pro quarterbacks.
Great pro quarterbacks.

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Great pro running backs.
Great pro running backs.

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Features fourteen of football's outstanding backs, including Jim Thorpe, Jim Brown, Gale Sayers, and O. J. Simpson.

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Tennis for beginners
Tennis for beginners

By Lud Duroska

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Discusses tennis history, grips, various strokes, playing doubles, and official rules.

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Tennis for beginners
Tennis for beginners

By Lud Duroska

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Discusses tennis history, grips, various strokes, playing doubles, and official rules.

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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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