Roger L. Di Silvestro Books

Audubon perspectives
Audubon perspectives

By Roger L. Di Silvestro

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This second book in the Audubon Perspectives series is the companion volume to the eight timely and important National Audubon Society television specials airing on TBS and PBS. While its predecess...

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Ursula's gift
Ursula's gift

By Roger L. Di Silvestro

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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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