Paul Gerald Books

60 hikes within 60 miles Portland

By Paul Gerald

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60 Hikes within 60 Miles Portland 3rd

By Paul Gerald

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Day section hikes Pacific Crest trail

By Paul Gerald

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Day Section Hikes Pacific Crest Trail

By Paul Gerald

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"Updated maps, new hikes, even more rankings and categories, fresh photography, and useful backpacking options make the newest edition of this authoritative guide to Portland's best day hikes the m...

60 Hikes within 60 Miles

By Paul Gerald

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Breakfast in bridgetown

By Paul Gerald

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"Breakfast in Bridgetown is the definitive guide to Portland's favorite meal. It's packed with descriptions of 120 restaurants, as well as food carts, hotels, and out-of-town locations. It also has...

The Groundhopper s Guide to Soccer in England 2018 19 Season

By Paul Gerald

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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.