Copyright 2020 by Purdue University. All rights reserved.

Printed in the United States of America.

Cataloging-in-Publication data is on file with the Library of Congress.

Hardback ISBN: 978-1-55753-874-1

EPUB ISBN: 978-1-61249-603-0

EPDF ISBN: 978-1-61249-602-3

Letters featured in this volume are from the Neil A. Armstrong papers in the Barron Hilton Flight and Space Exploration Archives, Purdue University Archives and Special Collections.