ON THE TRAIL OF VANISHING BIRDS 



Copyright 1957 by Robert Porter Allen. All rights in 

 this book are reserved. It may not be used for dramatic, 

 motion-, or talking-picture purposes without written au- 

 thorization from the holder of these rights. Nor may the 

 book or parts thereof be reproduced in any manner what- 

 soever without permission in writing, except in the case 

 of brief quotations embodied in critical articles and re- 

 views. For information, address the McGraw-Hill Book 

 Company, Inc., Trade Department, 330 West 42 d Street, 

 New York 36, New York. 



Library of Congress Catalog Card Number: 57-7225 



Published by the McGraw-Hill Book Company, Inc. 

 Printed in the United States of America 



The author is grateful to the editors of 

 BlackwoocFs Magazine and Audubon Magazine 

 for permission to reproduce in this book 

 material that has previously appeared 

 in their publications. 



