Gerald R. Allen Books

Reef fishes of New Guinea

By Gerald R. Allen

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Fishes of Western Australia

By Gerald R. Allen

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Field Guide to Tropical Reef Fishes of the Indo-Pacific

By Gerald R. Allen

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Now available in the US, this is the revised and expanded fifth edition of a book that has been the standard reference work for divers, anglers and scientists for over 30 years. The new edition cov...

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.