Copyright © 2017
by
The Goodheart-Willcox Company, Inc.
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 978-1-63126-255-5
3 4 5 6 7 8 9 – 17 – 21 20 19 18 17
The Goodheart-Willcox Company, Inc. Brand Disclaimer: Brand names, company names, and
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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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Cover images: ©iStock.com/Paul Hart (barn); nfsphoto/Shutterstock.com (cattle); Grandpa/Shutterstock.com (welder);
Chukov/Shutterstock.com (tractor); muratart/Shutterstock.com (irrigation); Sunny Forest/Shutterstock.com (corn field)
Back cover image: Elena Elisseeva