Copyright © 2018
by
The Goodheart-Willcox Company, Inc.
Previous editions copyright 2012, 2007, 2003, 2000, 1996, 1991, 1987, 1982, 1978, 1975, 1972
All rights reserved. No part of this work may be reproduced, stored, or transmitted in any
form or by any electronic or mechanical means, including information storage and retrieval
systems, without the prior written permission of The Goodheart-Willcox Company, Inc.
Manufactured in the United States of America.
ISBN 978-1-63126-265-4
2 3 4 5 6 7 8 9 – 18 – 20 19 18 17
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The Goodheart-Willcox Company, Inc. Safety Notice: The reader is expressly advised to
carefully read, understand, and apply all safety precautions and warnings described in this
book or that might also be indicated in undertaking the activities and exercises described
herein to minimize risk of personal injury or injury to others. Common sense and good
judgment should also be exercised and applied to help avoid all potential hazards. The reader
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The reader should understand these notices and cautions are not exhaustive.
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Back cover image: Laborant/Shutterstock.com