Justin F. Denzel Books

Adventure North

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A biography of the Norwegian explorer, scientist, statesman, and humanitarian whose many Arctic expeditions gathered much information on the geography and condition of the polar area.

Land of the thundering herds

By Justin F. Denzel

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The adventures and daily routine of a young lion, stallion, condor, herd of mammoths, and other prehistoric animals sharing a vast grassland.

Hunt for the last cat

By Justin F. Denzel

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Ten-year-old Thorn feels conflicting loyalties when members of his clan blame his friend Fonn, a girl from a rival clan, for the marauding actions of a man-eating sabertooth cat.

Return to the painted cave

By Justin F. Denzel

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Fourteen-year-old Tao, a cave painter living in prehistoric times, sets out on an odyssey to bring healing to the blind girl, Deha, and the outcast children.

Champion of liberty, Henry Knox

By Justin F. Denzel

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A biography of the man who was the first Secretary of War of the United States and one of the founders of the State of Maine.

Genius with a scalpel, Harvey Cushing

By Justin F. Denzel

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A biography of the pioneer brain surgeon whose perfection of many surgical techniques made him foremost in his field.

Jumbo: giant circus elephant

By Justin F. Denzel

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Recounts the experiences, at the London zoo and later as star of P.T. Barnum's circus, of a little African elephant who grew to be the largest of his kind ever seen.

Black Kettle: king of the wild horses

By Justin F. Denzel

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A wild black stallion, coveted by all who see him, is protected from capture by an Indian youth.

Wild Wing

By Justin F. Denzel

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A young Pueblo Indian boy trains a young eagle to hunt, with the help of a Spanish priest.

Snowfoot

By Justin F. Denzel, Taylor Oughton

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Despite his father's objections, a young Lapp nurses an injured reindeer back to health and trains him to become useful.

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

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.