Hal Koerner Books

Hal Koerner'S Field Guide To Ultrarunning: Training For An Ultramarathon, From 50K To 100 Miles And Beyond

By Hal Koerner, Hal Koerner, With Adam W. Chase, Foreword By Scott Jurek

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Ultramarathon doesn’t leave much room for mistakes. Don’t learn the hard way—get a jump on training for an ultramarathon with Hal Koerner’s Field Guide to Ultrarunning, a comprehensive handbook to...

Entrenar el ultramaraton

By Juan Carlos Ruiz Franco, Hal Koernes

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Hal Koerner s Field Guide to Ultrarunning

By Adam W. Chase, Scott Jurek, Hal Koerner

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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.