Regis St. Louis Books

Ecuador the Galapagos Islands

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"Colonial cities, misty cloud forests, towering Andean peaks, Amazonian rainforest and the otherwordly Galápagos - for such a small country Ecuador has a stunning array of natural and cultural wond...

Rio de Janeiro

By Regis St. Louis

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Golden beaches and lush mountains, colonial neighborhoods and modernist style, samba-fueled nightlife and spectacular football matches: welcome to the Cidade Maravilhosa (Marvelous City), where lif...

Brazil

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USA

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New York City

By Regis St. Louis

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Provides travel information about New York City, including cultural attractions, dining, nightlife, shopping, and lodging, with suggested itineraries, excursions, and practical information about th...

Spain Portugal s best trips

By Regis St. Louis, Andy Symington, Anthony Ham, Kerry Christiani, Brendan Sainsbury, Josephine Quintero, Noble John, Isabella Noble

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Discover the freedom of open roads while touring Spain and Portugal with Lonely Planet Spain and Portugal's Best Trips, your passport to up-to-date advice on uniquely encountering Spain and Portuga...

Portugal

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Brazil

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Discover USA

By Regis St. Louis

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USA

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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.