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Copyright © 2011 University of Pennsylvania Press All rights reserved. Except for brief quotations used for purposes of review or scholarly citation, none of this book may be reproduced in any form by any means without written permission from the publisher. Published by University of Pennsylvania Press Philadelphia, Pennsylvania 19104-4112 www.upenn.edu/pennpress Printed in Canada on acid-free paper 10 9 8 7 6 5 4 3 2 1 A Cataloging-in-Publication record is available from the Library of Congress ISBN 978-0-8122-4306-2 Frontispiece: Orontium aquaticum, photo by Roger E. Latham Block-Rhoads_FM_Final.indd 4 3/24/11 4:19 PM ...

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