Darwin Porter Books

Frommer s Portable Virgin Islands

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Frommer s Portable Dominican Republic

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Frommer's Portable Guides are for the short-term traveler who insists on value and doesn't want to pack a full-size guidebook. They have the same commitment to accuracy and detail as our Frommer's...

Frommer s Provence the Riviera

By Darwin Porter

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Frommer s Scotland

By Darwin Porter

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Experience a place the way the locals do. Enjoy the best it has to offer. Frommer's. The best trips start here. Whether it's the Edinburgh Festival or the fairways of St. Andrews that draw you t...

Frommer s Portable London 2006

By Darwin Porter

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Frommer s France 2006 AAA Edition

By Pirjo Kristiina Virtanen

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Including detailed walking tours to guide you through the cobblestone streets of Zurich, Bern, Geneva, and Lucerne.Outspoken opinions on what's worth your time and what's not.Exact prices, so you c...

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.