Paul A. Opler Books

Butterflies of North America
Butterflies of North America

By Paul Opler

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The Complete Book Of North American Butterflies
The Complete Book Of North American Butterflies

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Discover the many amazing butterfly breeds. This book includes an entire chapter devoted to the resilient migrating Monarch. With its vibrant orange and black markings, it is possibly the most reco...

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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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