Harry Kelsey Books

Sir Francis Drake: The Queen s Pirate

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In this new biography, Harry Kelsey shatters the familiar image of Sir Francis Drake. The Drake of legend was a pious, brave, and just seaman who initiated the move to make England a great naval po...

Sir Francis Drake: The Queen s Pirate

By Harry Kelsey

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Sir John Hawkins

By Harry Kelsey

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The first circumnavigators

By Harry Kelsey

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Prior histories of the first Spanish mariners to circumnavigate the globe in the sixteenth century have focused on Ferdinand Magellan and the other illustrious leaders of these daring expeditions....

Juan Rodriguez Cabrillo

By Harry Kelsey

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Juan Rodriguez Cabrillo

By Harry Kelsey

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Mission San Juan Capistrano

By Harry Kelsey

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Mission San Luis Rey

By Harry Kelsey

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Mission San Luis Rey

By Harry Kelsey

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Discovering Cabrillo

By Harry Kelsey

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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.