JOHNSGARD PAUL A Books

HUMMINGBIRDS NA
HUMMINGBIRDS NA

By Paul A. Johnsgard, JOHNSGARD PAUL A

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Paul A. Johnsgard's Hummingbirds of North America is the only book devoted to the identification, distribution, and biology - both individual and comparative - of all hummingbirds that breed in Nor...

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NA OWLS
NA OWLS

By JOHNSGARD PAUL A

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Grassland Grouse and Their Conservation
Grassland Grouse and Their Conservation

By Paul A. Johnsgard

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Paul Johnsgard, one of the world's leading ornithologists, has written this book as a call to action. Conservationists have seen a marked decline in the populations of North American grouse, partic...

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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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