Ray Holder Books

Residential Construction Academy
Residential Construction Academy

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Dewalt electrical licensing exam guide
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,...

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DeWalt electrical licensing exam guide
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...

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Iowa 2020 Master Electrician Exam Questions and Study Guide
Iowa 2020 Master Electrician Exam Questions and Study Guide

By Ray Holder

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The Iowa 2020 Master study guide will help you prepare for the exam by providing 12 practice open book exams and 2 Final Closed Book Exams. Includes Iowa License Forms and Sample Applications. This...

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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.

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