H. Ray Holder Books

Practical calculations for electricians

By H. Ray Holder

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DeWalt electrical licensing exam guide

By H. Ray Holder

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Dewalt electrical licensing exam guide

By H. Ray Holder

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A comprehensive exam study guide for electricians and apprentices that can be utilized in every state. Updated for the NEC 2014, this book is ideal for preparing to take the Journeyman, Contractor,...

2017 Journeyman Electrician Exam Questions and Study Guide

By Ray Holder

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2017 Master Electrician Exam Questions and Study Guide

By Ray Holder

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DEWALT Electrical Licensing Exam Guide Dewalt Exam Certification Series

By Ray Holder

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DEWALT Electrical Licensing Exam Guide Based on the NEC 2011

By Ray Holder

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DeWalt electrical licensing exam guide

By H. Ray Holder

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Shares test-taking strategies, regulations, and subject review for the journeyman, contractor, master, maintenance, residential, and sign licensing examinations, as well as over five hundred practi...

Texas Electricians Practice Exams Study Guide

By H. Ray Holder

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2020 Journeyman Electrician Exam Questions and Study Guide 400 Questions from 14 Tests

By Ray Holder

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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.